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<div class="section" id="module-inspect">
<span id="inspect-inspect-live-objects"></span><h1><a class="reference internal" href="#module-inspect" title="inspect: Extract information and source code from live objects."><code class="xref py py-mod docutils literal notranslate"><span class="pre">inspect</span></code></a> — Inspect live objects<a class="headerlink" href="#module-inspect" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/inspect.py">Lib/inspect.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-inspect" title="inspect: Extract information and source code from live objects."><code class="xref py py-mod docutils literal notranslate"><span class="pre">inspect</span></code></a> module provides several useful functions to help get
information about live objects such as modules, classes, methods, functions,
tracebacks, frame objects, and code objects. For example, it can help you
examine the contents of a class, retrieve the source code of a method, extract
and format the argument list for a function, or get all the information you need
to display a detailed traceback.</p>
<p>There are four main kinds of services provided by this module: type checking,
getting source code, inspecting classes and functions, and examining the
interpreter stack.</p>
<div class="section" id="types-and-members">
<span id="inspect-types"></span><h2>Types and members<a class="headerlink" href="#types-and-members" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="#inspect.getmembers" title="inspect.getmembers"><code class="xref py py-func docutils literal notranslate"><span class="pre">getmembers()</span></code></a> function retrieves the members of an object such as a
class or module. The functions whose names begin with “is” are mainly
provided as convenient choices for the second argument to <a class="reference internal" href="#inspect.getmembers" title="inspect.getmembers"><code class="xref py py-func docutils literal notranslate"><span class="pre">getmembers()</span></code></a>.
They also help you determine when you can expect to find the following special
attributes:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 19%" />
<col style="width: 33%" />
<col style="width: 47%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Type</p></th>
<th class="head"><p>Attribute</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>module</p></td>
<td><p>__doc__</p></td>
<td><p>documentation string</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__file__</p></td>
<td><p>filename (missing for
built-in modules)</p></td>
</tr>
<tr class="row-even"><td><p>class</p></td>
<td><p>__doc__</p></td>
<td><p>documentation string</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__name__</p></td>
<td><p>name with which this
class was defined</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__module__</p></td>
<td><p>name of module in which
this class was defined</p></td>
</tr>
<tr class="row-even"><td><p>method</p></td>
<td><p>__doc__</p></td>
<td><p>documentation string</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__name__</p></td>
<td><p>name with which this
method was defined</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__func__</p></td>
<td><p>function object
containing implementation
of method</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__self__</p></td>
<td><p>instance to which this
method is bound, or
<code class="docutils literal notranslate"><span class="pre">None</span></code></p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__module__</p></td>
<td><p>name of module in which
this method was defined</p></td>
</tr>
<tr class="row-even"><td><p>function</p></td>
<td><p>__doc__</p></td>
<td><p>documentation string</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__name__</p></td>
<td><p>name with which this
function was defined</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__code__</p></td>
<td><p>code object containing
compiled function
<a class="reference internal" href="../glossary.html#term-bytecode"><span class="xref std std-term">bytecode</span></a></p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__defaults__</p></td>
<td><p>tuple of any default
values for positional or
keyword parameters</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__kwdefaults__</p></td>
<td><p>mapping of any default
values for keyword-only
parameters</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__globals__</p></td>
<td><p>global namespace in which
this function was defined</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__annotations__</p></td>
<td><p>mapping of parameters
names to annotations;
<code class="docutils literal notranslate"><span class="pre">"return"</span></code> key is
reserved for return
annotations.</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__module__</p></td>
<td><p>name of module in which
this function was defined</p></td>
</tr>
<tr class="row-odd"><td><p>traceback</p></td>
<td><p>tb_frame</p></td>
<td><p>frame object at this
level</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>tb_lasti</p></td>
<td><p>index of last attempted
instruction in bytecode</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>tb_lineno</p></td>
<td><p>current line number in
Python source code</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>tb_next</p></td>
<td><p>next inner traceback
object (called by this
level)</p></td>
</tr>
<tr class="row-odd"><td><p>frame</p></td>
<td><p>f_back</p></td>
<td><p>next outer frame object
(this frame’s caller)</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>f_builtins</p></td>
<td><p>builtins namespace seen
by this frame</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>f_code</p></td>
<td><p>code object being
executed in this frame</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>f_globals</p></td>
<td><p>global namespace seen by
this frame</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>f_lasti</p></td>
<td><p>index of last attempted
instruction in bytecode</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>f_lineno</p></td>
<td><p>current line number in
Python source code</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>f_locals</p></td>
<td><p>local namespace seen by
this frame</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>f_trace</p></td>
<td><p>tracing function for this
frame, or <code class="docutils literal notranslate"><span class="pre">None</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>code</p></td>
<td><p>co_argcount</p></td>
<td><p>number of arguments (not
including keyword only
arguments, * or **
args)</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_code</p></td>
<td><p>string of raw compiled
bytecode</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_cellvars</p></td>
<td><p>tuple of names of cell
variables (referenced by
containing scopes)</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_consts</p></td>
<td><p>tuple of constants used
in the bytecode</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_filename</p></td>
<td><p>name of file in which
this code object was
created</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_firstlineno</p></td>
<td><p>number of first line in
Python source code</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_flags</p></td>
<td><p>bitmap of <code class="docutils literal notranslate"><span class="pre">CO_*</span></code> flags,
read more <a class="reference internal" href="#inspect-module-co-flags"><span class="std std-ref">here</span></a></p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_lnotab</p></td>
<td><p>encoded mapping of line
numbers to bytecode
indices</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_freevars</p></td>
<td><p>tuple of names of free
variables (referenced via
a function’s closure)</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_kwonlyargcount</p></td>
<td><p>number of keyword only
arguments (not including
** arg)</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_name</p></td>
<td><p>name with which this code
object was defined</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_names</p></td>
<td><p>tuple of names of local
variables</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_nlocals</p></td>
<td><p>number of local variables</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>co_stacksize</p></td>
<td><p>virtual machine stack
space required</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>co_varnames</p></td>
<td><p>tuple of names of
arguments and local
variables</p></td>
</tr>
<tr class="row-even"><td><p>generator</p></td>
<td><p>__name__</p></td>
<td><p>name</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>gi_frame</p></td>
<td><p>frame</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>gi_running</p></td>
<td><p>is the generator running?</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>gi_code</p></td>
<td><p>code</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>gi_yieldfrom</p></td>
<td><p>object being iterated by
<code class="docutils literal notranslate"><span class="pre">yield</span> <span class="pre">from</span></code>, or
<code class="docutils literal notranslate"><span class="pre">None</span></code></p></td>
</tr>
<tr class="row-even"><td><p>coroutine</p></td>
<td><p>__name__</p></td>
<td><p>name</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>cr_await</p></td>
<td><p>object being awaited on,
or <code class="docutils literal notranslate"><span class="pre">None</span></code></p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>cr_frame</p></td>
<td><p>frame</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>cr_running</p></td>
<td><p>is the coroutine running?</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>cr_code</p></td>
<td><p>code</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>cr_origin</p></td>
<td><p>where coroutine was
created, or <code class="docutils literal notranslate"><span class="pre">None</span></code>. See
<a class="reference internal" href="sys.html#sys.set_coroutine_origin_tracking_depth" title="sys.set_coroutine_origin_tracking_depth"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.set_coroutine_origin_tracking_depth()</span></code></a></p></td>
</tr>
<tr class="row-odd"><td><p>builtin</p></td>
<td><p>__doc__</p></td>
<td><p>documentation string</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__name__</p></td>
<td><p>original name of this
function or method</p></td>
</tr>
<tr class="row-odd"><td></td>
<td><p>__qualname__</p></td>
<td><p>qualified name</p></td>
</tr>
<tr class="row-even"><td></td>
<td><p>__self__</p></td>
<td><p>instance to which a
method is bound, or
<code class="docutils literal notranslate"><span class="pre">None</span></code></p></td>
</tr>
</tbody>
</table>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Add <code class="docutils literal notranslate"><span class="pre">__qualname__</span></code> and <code class="docutils literal notranslate"><span class="pre">gi_yieldfrom</span></code> attributes to generators.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">__name__</span></code> attribute of generators is now set from the function
name, instead of the code name, and it can now be modified.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>Add <code class="docutils literal notranslate"><span class="pre">cr_origin</span></code> attribute to coroutines.</p>
</div>
<dl class="function">
<dt id="inspect.getmembers">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getmembers</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="optional">[</span>, <em class="sig-param">predicate</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getmembers" title="Permalink to this definition">¶</a></dt>
<dd><p>Return all the members of an object in a list of (name, value) pairs sorted by
name. If the optional <em>predicate</em> argument is supplied, only members for which
the predicate returns a true value are included.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><a class="reference internal" href="#inspect.getmembers" title="inspect.getmembers"><code class="xref py py-func docutils literal notranslate"><span class="pre">getmembers()</span></code></a> will only return class attributes defined in the
metaclass when the argument is a class and those attributes have been
listed in the metaclass’ custom <a class="reference internal" href="../reference/datamodel.html#object.__dir__" title="object.__dir__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__dir__()</span></code></a>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getmodulename">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getmodulename</code><span class="sig-paren">(</span><em class="sig-param">path</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getmodulename" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the name of the module named by the file <em>path</em>, without including the
names of enclosing packages. The file extension is checked against all of
the entries in <a class="reference internal" href="importlib.html#importlib.machinery.all_suffixes" title="importlib.machinery.all_suffixes"><code class="xref py py-func docutils literal notranslate"><span class="pre">importlib.machinery.all_suffixes()</span></code></a>. If it matches,
the final path component is returned with the extension removed.
Otherwise, <code class="docutils literal notranslate"><span class="pre">None</span></code> is returned.</p>
<p>Note that this function <em>only</em> returns a meaningful name for actual
Python modules - paths that potentially refer to Python packages will
still return <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span>The function is based directly on <a class="reference internal" href="importlib.html#module-importlib" title="importlib: The implementation of the import machinery."><code class="xref py py-mod docutils literal notranslate"><span class="pre">importlib</span></code></a>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.ismodule">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">ismodule</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.ismodule" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a module.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isclass">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isclass</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isclass" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a class, whether built-in or created in Python
code.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.ismethod">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">ismethod</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.ismethod" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a bound method written in Python.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isfunction">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isfunction</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isfunction" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a Python function, which includes functions
created by a <a class="reference internal" href="../glossary.html#term-lambda"><span class="xref std std-term">lambda</span></a> expression.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isgeneratorfunction">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isgeneratorfunction</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isgeneratorfunction" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a Python generator function.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isgenerator">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isgenerator</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isgenerator" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a generator.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.iscoroutinefunction">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">iscoroutinefunction</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.iscoroutinefunction" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a <a class="reference internal" href="../glossary.html#term-coroutine-function"><span class="xref std std-term">coroutine function</span></a>
(a function defined with an <a class="reference internal" href="../reference/compound_stmts.html#async-def"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">async</span> <span class="pre">def</span></code></a> syntax).</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.iscoroutine">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">iscoroutine</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.iscoroutine" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a <a class="reference internal" href="../glossary.html#term-coroutine"><span class="xref std std-term">coroutine</span></a> created by an
<a class="reference internal" href="../reference/compound_stmts.html#async-def"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">async</span> <span class="pre">def</span></code></a> function.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.isawaitable">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isawaitable</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isawaitable" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object can be used in <a class="reference internal" href="../reference/expressions.html#await"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">await</span></code></a> expression.</p>
<p>Can also be used to distinguish generator-based coroutines from regular
generators:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">gen</span><span class="p">():</span>
<span class="k">yield</span>
<span class="nd">@types</span><span class="o">.</span><span class="n">coroutine</span>
<span class="k">def</span> <span class="nf">gen_coro</span><span class="p">():</span>
<span class="k">yield</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="n">isawaitable</span><span class="p">(</span><span class="n">gen</span><span class="p">())</span>
<span class="k">assert</span> <span class="n">isawaitable</span><span class="p">(</span><span class="n">gen_coro</span><span class="p">())</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.isasyncgenfunction">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isasyncgenfunction</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isasyncgenfunction" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is an <a class="reference internal" href="../glossary.html#term-asynchronous-generator"><span class="xref std std-term">asynchronous generator</span></a> function,
for example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">async</span> <span class="k">def</span> <span class="nf">agen</span><span class="p">():</span>
<span class="gp">... </span> <span class="k">yield</span> <span class="mi">1</span>
<span class="gp">...</span>
<span class="gp">>>> </span><span class="n">inspect</span><span class="o">.</span><span class="n">isasyncgenfunction</span><span class="p">(</span><span class="n">agen</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.isasyncgen">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isasyncgen</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isasyncgen" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is an <a class="reference internal" href="../glossary.html#term-asynchronous-generator-iterator"><span class="xref std std-term">asynchronous generator iterator</span></a>
created by an <a class="reference internal" href="../glossary.html#term-asynchronous-generator"><span class="xref std std-term">asynchronous generator</span></a> function.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.istraceback">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">istraceback</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.istraceback" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a traceback.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isframe">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isframe</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isframe" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a frame.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.iscode">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">iscode</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.iscode" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a code.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isbuiltin">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isbuiltin</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isbuiltin" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a built-in function or a bound built-in method.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isroutine">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isroutine</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isroutine" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a user-defined or built-in function or method.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isabstract">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isabstract</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isabstract" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is an abstract base class.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.ismethoddescriptor">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">ismethoddescriptor</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.ismethoddescriptor" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a method descriptor, but not if
<a class="reference internal" href="#inspect.ismethod" title="inspect.ismethod"><code class="xref py py-func docutils literal notranslate"><span class="pre">ismethod()</span></code></a>, <a class="reference internal" href="#inspect.isclass" title="inspect.isclass"><code class="xref py py-func docutils literal notranslate"><span class="pre">isclass()</span></code></a>, <a class="reference internal" href="#inspect.isfunction" title="inspect.isfunction"><code class="xref py py-func docutils literal notranslate"><span class="pre">isfunction()</span></code></a> or <a class="reference internal" href="#inspect.isbuiltin" title="inspect.isbuiltin"><code class="xref py py-func docutils literal notranslate"><span class="pre">isbuiltin()</span></code></a>
are true.</p>
<p>This, for example, is true of <code class="docutils literal notranslate"><span class="pre">int.__add__</span></code>. An object passing this test
has a <a class="reference internal" href="../reference/datamodel.html#object.__get__" title="object.__get__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__get__()</span></code></a> method but not a <a class="reference internal" href="../reference/datamodel.html#object.__set__" title="object.__set__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__set__()</span></code></a>
method, but beyond that the set of attributes varies. A
<a class="reference internal" href="stdtypes.html#definition.__name__" title="definition.__name__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__name__</span></code></a> attribute is usually
sensible, and <code class="xref py py-attr docutils literal notranslate"><span class="pre">__doc__</span></code> often is.</p>
<p>Methods implemented via descriptors that also pass one of the other tests
return <code class="docutils literal notranslate"><span class="pre">False</span></code> from the <a class="reference internal" href="#inspect.ismethoddescriptor" title="inspect.ismethoddescriptor"><code class="xref py py-func docutils literal notranslate"><span class="pre">ismethoddescriptor()</span></code></a> test, simply because the
other tests promise more – you can, e.g., count on having the
<code class="xref py py-attr docutils literal notranslate"><span class="pre">__func__</span></code> attribute (etc) when an object passes <a class="reference internal" href="#inspect.ismethod" title="inspect.ismethod"><code class="xref py py-func docutils literal notranslate"><span class="pre">ismethod()</span></code></a>.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isdatadescriptor">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isdatadescriptor</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isdatadescriptor" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a data descriptor.</p>
<p>Data descriptors have both a <a class="reference internal" href="../reference/datamodel.html#object.__get__" title="object.__get__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__get__</span></code></a> and a <a class="reference internal" href="../reference/datamodel.html#object.__set__" title="object.__set__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__set__</span></code></a> method.
Examples are properties (defined in Python), getsets, and members. The
latter two are defined in C and there are more specific tests available for
those types, which is robust across Python implementations. Typically, data
descriptors will also have <a class="reference internal" href="stdtypes.html#definition.__name__" title="definition.__name__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__name__</span></code></a> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">__doc__</span></code> attributes
(properties, getsets, and members have both of these attributes), but this is
not guaranteed.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.isgetsetdescriptor">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">isgetsetdescriptor</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.isgetsetdescriptor" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a getset descriptor.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> getsets are attributes defined in extension modules via
<a class="reference internal" href="../c-api/structures.html#c.PyGetSetDef" title="PyGetSetDef"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyGetSetDef</span></code></a> structures. For Python implementations without such
types, this method will always return <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.ismemberdescriptor">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">ismemberdescriptor</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.ismemberdescriptor" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the object is a member descriptor.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> Member descriptors are attributes defined in extension modules via
<a class="reference internal" href="../c-api/structures.html#c.PyMemberDef" title="PyMemberDef"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyMemberDef</span></code></a> structures. For Python implementations without such
types, this method will always return <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p>
</div>
</dd></dl>
</div>
<div class="section" id="retrieving-source-code">
<span id="inspect-source"></span><h2>Retrieving source code<a class="headerlink" href="#retrieving-source-code" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="inspect.getdoc">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getdoc</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getdoc" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the documentation string for an object, cleaned up with <a class="reference internal" href="#inspect.cleandoc" title="inspect.cleandoc"><code class="xref py py-func docutils literal notranslate"><span class="pre">cleandoc()</span></code></a>.
If the documentation string for an object is not provided and the object is
a class, a method, a property or a descriptor, retrieve the documentation
string from the inheritance hierarchy.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Documentation strings are now inherited if not overridden.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getcomments">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getcomments</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getcomments" title="Permalink to this definition">¶</a></dt>
<dd><p>Return in a single string any lines of comments immediately preceding the
object’s source code (for a class, function, or method), or at the top of the
Python source file (if the object is a module). If the object’s source code
is unavailable, return <code class="docutils literal notranslate"><span class="pre">None</span></code>. This could happen if the object has been
defined in C or the interactive shell.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getfile">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getfile</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getfile" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the name of the (text or binary) file in which an object was defined.
This will fail with a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> if the object is a built-in module,
class, or function.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getmodule">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getmodule</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getmodule" title="Permalink to this definition">¶</a></dt>
<dd><p>Try to guess which module an object was defined in.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getsourcefile">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getsourcefile</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getsourcefile" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the name of the Python source file in which an object was defined. This
will fail with a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> if the object is a built-in module, class, or
function.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getsourcelines">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getsourcelines</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getsourcelines" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a list of source lines and starting line number for an object. The
argument may be a module, class, method, function, traceback, frame, or code
object. The source code is returned as a list of the lines corresponding to the
object and the line number indicates where in the original source file the first
line of code was found. An <a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a> is raised if the source code cannot
be retrieved.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a> is raised instead of <a class="reference internal" href="exceptions.html#IOError" title="IOError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a>, now an alias of the
former.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getsource">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getsource</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getsource" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the text of the source code for an object. The argument may be a module,
class, method, function, traceback, frame, or code object. The source code is
returned as a single string. An <a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a> is raised if the source code
cannot be retrieved.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a> is raised instead of <a class="reference internal" href="exceptions.html#IOError" title="IOError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a>, now an alias of the
former.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.cleandoc">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">cleandoc</code><span class="sig-paren">(</span><em class="sig-param">doc</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.cleandoc" title="Permalink to this definition">¶</a></dt>
<dd><p>Clean up indentation from docstrings that are indented to line up with blocks
of code.</p>
<p>All leading whitespace is removed from the first line. Any leading whitespace
that can be uniformly removed from the second line onwards is removed. Empty
lines at the beginning and end are subsequently removed. Also, all tabs are
expanded to spaces.</p>
</dd></dl>
</div>
<div class="section" id="introspecting-callables-with-the-signature-object">
<span id="inspect-signature-object"></span><h2>Introspecting callables with the Signature object<a class="headerlink" href="#introspecting-callables-with-the-signature-object" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.3.</span></p>
</div>
<p>The Signature object represents the call signature of a callable object and its
return annotation. To retrieve a Signature object, use the <a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a>
function.</p>
<dl class="function">
<dt id="inspect.signature">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">signature</code><span class="sig-paren">(</span><em class="sig-param">callable</em>, <em class="sig-param">*</em>, <em class="sig-param">follow_wrapped=True</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.signature" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a <a class="reference internal" href="#inspect.Signature" title="inspect.Signature"><code class="xref py py-class docutils literal notranslate"><span class="pre">Signature</span></code></a> object for the given <code class="docutils literal notranslate"><span class="pre">callable</span></code>:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">inspect</span> <span class="kn">import</span> <span class="n">signature</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">foo</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">b</span><span class="p">:</span><span class="nb">int</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">sig</span> <span class="o">=</span> <span class="n">signature</span><span class="p">(</span><span class="n">foo</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">sig</span><span class="p">)</span>
<span class="go">'(a, *, b:int, **kwargs)'</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">sig</span><span class="o">.</span><span class="n">parameters</span><span class="p">[</span><span class="s1">'b'</span><span class="p">])</span>
<span class="go">'b:int'</span>
<span class="gp">>>> </span><span class="n">sig</span><span class="o">.</span><span class="n">parameters</span><span class="p">[</span><span class="s1">'b'</span><span class="p">]</span><span class="o">.</span><span class="n">annotation</span>
<span class="go"><class 'int'></span>
</pre></div>
</div>
<p>Accepts a wide range of Python callables, from plain functions and classes to
<a class="reference internal" href="functools.html#functools.partial" title="functools.partial"><code class="xref py py-func docutils literal notranslate"><span class="pre">functools.partial()</span></code></a> objects.</p>
<p>Raises <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> if no signature can be provided, and
<a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> if that type of object is not supported.</p>
<p>A slash(/) in the signature of a function denotes that the parameters prior
to it are positional-only. For more info, see
<a class="reference internal" href="../faq/programming.html#faq-positional-only-arguments"><span class="std std-ref">the FAQ entry on positional-only parameters</span></a>.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5: </span><code class="docutils literal notranslate"><span class="pre">follow_wrapped</span></code> parameter. Pass <code class="docutils literal notranslate"><span class="pre">False</span></code> to get a signature of
<code class="docutils literal notranslate"><span class="pre">callable</span></code> specifically (<code class="docutils literal notranslate"><span class="pre">callable.__wrapped__</span></code> will not be used to
unwrap decorated callables.)</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Some callables may not be introspectable in certain implementations of
Python. For example, in CPython, some built-in functions defined in
C provide no metadata about their arguments.</p>
</div>
</dd></dl>
<dl class="class">
<dt id="inspect.Signature">
<em class="property">class </em><code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">Signature</code><span class="sig-paren">(</span><em class="sig-param">parameters=None</em>, <em class="sig-param">*</em>, <em class="sig-param">return_annotation=Signature.empty</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Signature" title="Permalink to this definition">¶</a></dt>
<dd><p>A Signature object represents the call signature of a function and its return
annotation. For each parameter accepted by the function it stores a
<a class="reference internal" href="#inspect.Parameter" title="inspect.Parameter"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parameter</span></code></a> object in its <a class="reference internal" href="#inspect.Signature.parameters" title="inspect.Signature.parameters"><code class="xref py py-attr docutils literal notranslate"><span class="pre">parameters</span></code></a> collection.</p>
<p>The optional <em>parameters</em> argument is a sequence of <a class="reference internal" href="#inspect.Parameter" title="inspect.Parameter"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parameter</span></code></a>
objects, which is validated to check that there are no parameters with
duplicate names, and that the parameters are in the right order, i.e.
positional-only first, then positional-or-keyword, and that parameters with
defaults follow parameters without defaults.</p>
<p>The optional <em>return_annotation</em> argument, can be an arbitrary Python object,
is the “return” annotation of the callable.</p>
<p>Signature objects are <em>immutable</em>. Use <a class="reference internal" href="#inspect.Signature.replace" title="inspect.Signature.replace"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.replace()</span></code></a> to make a
modified copy.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Signature objects are picklable and hashable.</p>
</div>
<dl class="attribute">
<dt id="inspect.Signature.empty">
<code class="sig-name descname">empty</code><a class="headerlink" href="#inspect.Signature.empty" title="Permalink to this definition">¶</a></dt>
<dd><p>A special class-level marker to specify absence of a return annotation.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Signature.parameters">
<code class="sig-name descname">parameters</code><a class="headerlink" href="#inspect.Signature.parameters" title="Permalink to this definition">¶</a></dt>
<dd><p>An ordered mapping of parameters’ names to the corresponding
<a class="reference internal" href="#inspect.Parameter" title="inspect.Parameter"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parameter</span></code></a> objects. Parameters appear in strict definition
order, including keyword-only parameters.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>Python only explicitly guaranteed that it preserved the declaration
order of keyword-only parameters as of version 3.7, although in practice
this order had always been preserved in Python 3.</p>
</div>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Signature.return_annotation">
<code class="sig-name descname">return_annotation</code><a class="headerlink" href="#inspect.Signature.return_annotation" title="Permalink to this definition">¶</a></dt>
<dd><p>The “return” annotation for the callable. If the callable has no “return”
annotation, this attribute is set to <a class="reference internal" href="#inspect.Signature.empty" title="inspect.Signature.empty"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Signature.empty</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="inspect.Signature.bind">
<code class="sig-name descname">bind</code><span class="sig-paren">(</span><em class="sig-param">*args</em>, <em class="sig-param">**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Signature.bind" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a mapping from positional and keyword arguments to parameters.
Returns <a class="reference internal" href="#inspect.BoundArguments" title="inspect.BoundArguments"><code class="xref py py-class docutils literal notranslate"><span class="pre">BoundArguments</span></code></a> if <code class="docutils literal notranslate"><span class="pre">*args</span></code> and <code class="docutils literal notranslate"><span class="pre">**kwargs</span></code> match the
signature, or raises a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="inspect.Signature.bind_partial">
<code class="sig-name descname">bind_partial</code><span class="sig-paren">(</span><em class="sig-param">*args</em>, <em class="sig-param">**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Signature.bind_partial" title="Permalink to this definition">¶</a></dt>
<dd><p>Works the same way as <a class="reference internal" href="#inspect.Signature.bind" title="inspect.Signature.bind"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind()</span></code></a>, but allows the omission of
some required arguments (mimics <a class="reference internal" href="functools.html#functools.partial" title="functools.partial"><code class="xref py py-func docutils literal notranslate"><span class="pre">functools.partial()</span></code></a> behavior.)
Returns <a class="reference internal" href="#inspect.BoundArguments" title="inspect.BoundArguments"><code class="xref py py-class docutils literal notranslate"><span class="pre">BoundArguments</span></code></a>, or raises a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> if the
passed arguments do not match the signature.</p>
</dd></dl>
<dl class="method">
<dt id="inspect.Signature.replace">
<code class="sig-name descname">replace</code><span class="sig-paren">(</span><em class="sig-param">*[, parameters][, return_annotation]</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Signature.replace" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a new Signature instance based on the instance replace was invoked
on. It is possible to pass different <code class="docutils literal notranslate"><span class="pre">parameters</span></code> and/or
<code class="docutils literal notranslate"><span class="pre">return_annotation</span></code> to override the corresponding properties of the base
signature. To remove return_annotation from the copied Signature, pass in
<a class="reference internal" href="#inspect.Signature.empty" title="inspect.Signature.empty"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Signature.empty</span></code></a>.</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">sig</span> <span class="o">=</span> <span class="n">signature</span><span class="p">(</span><span class="n">test</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">new_sig</span> <span class="o">=</span> <span class="n">sig</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">return_annotation</span><span class="o">=</span><span class="s2">"new return anno"</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">new_sig</span><span class="p">)</span>
<span class="go">"(a, b) -> 'new return anno'"</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="inspect.Signature.from_callable">
<em class="property">classmethod </em><code class="sig-name descname">from_callable</code><span class="sig-paren">(</span><em class="sig-param">obj</em>, <em class="sig-param">*</em>, <em class="sig-param">follow_wrapped=True</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Signature.from_callable" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a <a class="reference internal" href="#inspect.Signature" title="inspect.Signature"><code class="xref py py-class docutils literal notranslate"><span class="pre">Signature</span></code></a> (or its subclass) object for a given callable
<code class="docutils literal notranslate"><span class="pre">obj</span></code>. Pass <code class="docutils literal notranslate"><span class="pre">follow_wrapped=False</span></code> to get a signature of <code class="docutils literal notranslate"><span class="pre">obj</span></code>
without unwrapping its <code class="docutils literal notranslate"><span class="pre">__wrapped__</span></code> chain.</p>
<p>This method simplifies subclassing of <a class="reference internal" href="#inspect.Signature" title="inspect.Signature"><code class="xref py py-class docutils literal notranslate"><span class="pre">Signature</span></code></a>:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MySignature</span><span class="p">(</span><span class="n">Signature</span><span class="p">):</span>
<span class="k">pass</span>
<span class="n">sig</span> <span class="o">=</span> <span class="n">MySignature</span><span class="o">.</span><span class="n">from_callable</span><span class="p">(</span><span class="nb">min</span><span class="p">)</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">sig</span><span class="p">,</span> <span class="n">MySignature</span><span class="p">)</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="inspect.Parameter">
<em class="property">class </em><code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">Parameter</code><span class="sig-paren">(</span><em class="sig-param">name</em>, <em class="sig-param">kind</em>, <em class="sig-param">*</em>, <em class="sig-param">default=Parameter.empty</em>, <em class="sig-param">annotation=Parameter.empty</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Parameter" title="Permalink to this definition">¶</a></dt>
<dd><p>Parameter objects are <em>immutable</em>. Instead of modifying a Parameter object,
you can use <a class="reference internal" href="#inspect.Parameter.replace" title="inspect.Parameter.replace"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Parameter.replace()</span></code></a> to create a modified copy.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Parameter objects are picklable and hashable.</p>
</div>
<dl class="attribute">
<dt id="inspect.Parameter.empty">
<code class="sig-name descname">empty</code><a class="headerlink" href="#inspect.Parameter.empty" title="Permalink to this definition">¶</a></dt>
<dd><p>A special class-level marker to specify absence of default values and
annotations.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Parameter.name">
<code class="sig-name descname">name</code><a class="headerlink" href="#inspect.Parameter.name" title="Permalink to this definition">¶</a></dt>
<dd><p>The name of the parameter as a string. The name must be a valid
Python identifier.</p>
<div class="impl-detail compound">
<p class="compound-first"><strong>CPython implementation detail:</strong> CPython generates implicit parameter names of the form <code class="docutils literal notranslate"><span class="pre">.0</span></code> on the
code objects used to implement comprehensions and generator
expressions.</p>
<div class="compound-last versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>These parameter names are exposed by this module as names like
<code class="docutils literal notranslate"><span class="pre">implicit0</span></code>.</p>
</div>
</div>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Parameter.default">
<code class="sig-name descname">default</code><a class="headerlink" href="#inspect.Parameter.default" title="Permalink to this definition">¶</a></dt>
<dd><p>The default value for the parameter. If the parameter has no default
value, this attribute is set to <a class="reference internal" href="#inspect.Parameter.empty" title="inspect.Parameter.empty"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Parameter.empty</span></code></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Parameter.annotation">
<code class="sig-name descname">annotation</code><a class="headerlink" href="#inspect.Parameter.annotation" title="Permalink to this definition">¶</a></dt>
<dd><p>The annotation for the parameter. If the parameter has no annotation,
this attribute is set to <a class="reference internal" href="#inspect.Parameter.empty" title="inspect.Parameter.empty"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Parameter.empty</span></code></a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.Parameter.kind">
<code class="sig-name descname">kind</code><a class="headerlink" href="#inspect.Parameter.kind" title="Permalink to this definition">¶</a></dt>
<dd><p>Describes how argument values are bound to the parameter. Possible values
(accessible via <a class="reference internal" href="#inspect.Parameter" title="inspect.Parameter"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parameter</span></code></a>, like <code class="docutils literal notranslate"><span class="pre">Parameter.KEYWORD_ONLY</span></code>):</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 34%" />
<col style="width: 66%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Name</p></th>
<th class="head"><p>Meaning</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><em>POSITIONAL_ONLY</em></p></td>
<td><p>Value must be supplied as a positional
argument.</p>
<p>Python has no explicit syntax for defining
positional-only parameters, but many built-in
and extension module functions (especially
those that accept only one or two parameters)
accept them.</p>
</td>
</tr>
<tr class="row-odd"><td><p><em>POSITIONAL_OR_KEYWORD</em></p></td>
<td><p>Value may be supplied as either a keyword or
positional argument (this is the standard
binding behaviour for functions implemented
in Python.)</p></td>
</tr>
<tr class="row-even"><td><p><em>VAR_POSITIONAL</em></p></td>
<td><p>A tuple of positional arguments that aren’t
bound to any other parameter. This
corresponds to a <code class="docutils literal notranslate"><span class="pre">*args</span></code> parameter in a
Python function definition.</p></td>
</tr>
<tr class="row-odd"><td><p><em>KEYWORD_ONLY</em></p></td>
<td><p>Value must be supplied as a keyword argument.
Keyword only parameters are those which
appear after a <code class="docutils literal notranslate"><span class="pre">*</span></code> or <code class="docutils literal notranslate"><span class="pre">*args</span></code> entry in a
Python function definition.</p></td>
</tr>
<tr class="row-even"><td><p><em>VAR_KEYWORD</em></p></td>
<td><p>A dict of keyword arguments that aren’t bound
to any other parameter. This corresponds to a
<code class="docutils literal notranslate"><span class="pre">**kwargs</span></code> parameter in a Python function
definition.</p></td>
</tr>
</tbody>
</table>
<p>Example: print all keyword-only arguments without default values:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">def</span> <span class="nf">foo</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">c</span><span class="p">,</span> <span class="n">d</span><span class="o">=</span><span class="mi">10</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">sig</span> <span class="o">=</span> <span class="n">signature</span><span class="p">(</span><span class="n">foo</span><span class="p">)</span>
<span class="gp">>>> </span><span class="k">for</span> <span class="n">param</span> <span class="ow">in</span> <span class="n">sig</span><span class="o">.</span><span class="n">parameters</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
<span class="gp">... </span> <span class="k">if</span> <span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">kind</span> <span class="o">==</span> <span class="n">param</span><span class="o">.</span><span class="n">KEYWORD_ONLY</span> <span class="ow">and</span>
<span class="gp">... </span> <span class="n">param</span><span class="o">.</span><span class="n">default</span> <span class="ow">is</span> <span class="n">param</span><span class="o">.</span><span class="n">empty</span><span class="p">):</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s1">'Parameter:'</span><span class="p">,</span> <span class="n">param</span><span class="p">)</span>
<span class="go">Parameter: c</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="inspect.Parameter.replace">
<code class="sig-name descname">replace</code><span class="sig-paren">(</span><em class="sig-param">*[, name][, kind][, default][, annotation]</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.Parameter.replace" title="Permalink to this definition">¶</a></dt>
<dd><blockquote>
<div><p>Create a new Parameter instance based on the instance replaced was invoked
on. To override a <a class="reference internal" href="#inspect.Parameter" title="inspect.Parameter"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parameter</span></code></a> attribute, pass the corresponding
argument. To remove a default value or/and an annotation from a
Parameter, pass <a class="reference internal" href="#inspect.Parameter.empty" title="inspect.Parameter.empty"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Parameter.empty</span></code></a>.</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">inspect</span> <span class="kn">import</span> <span class="n">Parameter</span>
<span class="gp">>>> </span><span class="n">param</span> <span class="o">=</span> <span class="n">Parameter</span><span class="p">(</span><span class="s1">'foo'</span><span class="p">,</span> <span class="n">Parameter</span><span class="o">.</span><span class="n">KEYWORD_ONLY</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="mi">42</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">param</span><span class="p">)</span>
<span class="go">'foo=42'</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">replace</span><span class="p">())</span> <span class="c1"># Will create a shallow copy of 'param'</span>
<span class="go">'foo=42'</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="n">Parameter</span><span class="o">.</span><span class="n">empty</span><span class="p">,</span> <span class="n">annotation</span><span class="o">=</span><span class="s1">'spam'</span><span class="p">))</span>
<span class="go">"foo:'spam'"</span>
</pre></div>
</div>
</div></blockquote>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>In Python 3.3 Parameter objects were allowed to have <code class="docutils literal notranslate"><span class="pre">name</span></code> set
to <code class="docutils literal notranslate"><span class="pre">None</span></code> if their <code class="docutils literal notranslate"><span class="pre">kind</span></code> was set to <code class="docutils literal notranslate"><span class="pre">POSITIONAL_ONLY</span></code>.
This is no longer permitted.</p>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="inspect.BoundArguments">
<em class="property">class </em><code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">BoundArguments</code><a class="headerlink" href="#inspect.BoundArguments" title="Permalink to this definition">¶</a></dt>
<dd><p>Result of a <a class="reference internal" href="#inspect.Signature.bind" title="inspect.Signature.bind"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind()</span></code></a> or <a class="reference internal" href="#inspect.Signature.bind_partial" title="inspect.Signature.bind_partial"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind_partial()</span></code></a> call.
Holds the mapping of arguments to the function’s parameters.</p>
<dl class="attribute">
<dt id="inspect.BoundArguments.arguments">
<code class="sig-name descname">arguments</code><a class="headerlink" href="#inspect.BoundArguments.arguments" title="Permalink to this definition">¶</a></dt>
<dd><p>An ordered, mutable mapping (<a class="reference internal" href="collections.html#collections.OrderedDict" title="collections.OrderedDict"><code class="xref py py-class docutils literal notranslate"><span class="pre">collections.OrderedDict</span></code></a>) of
parameters’ names to arguments’ values. Contains only explicitly bound
arguments. Changes in <a class="reference internal" href="#inspect.BoundArguments.arguments" title="inspect.BoundArguments.arguments"><code class="xref py py-attr docutils literal notranslate"><span class="pre">arguments</span></code></a> will reflect in <a class="reference internal" href="#inspect.BoundArguments.args" title="inspect.BoundArguments.args"><code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code></a> and
<a class="reference internal" href="#inspect.BoundArguments.kwargs" title="inspect.BoundArguments.kwargs"><code class="xref py py-attr docutils literal notranslate"><span class="pre">kwargs</span></code></a>.</p>
<p>Should be used in conjunction with <a class="reference internal" href="#inspect.Signature.parameters" title="inspect.Signature.parameters"><code class="xref py py-attr docutils literal notranslate"><span class="pre">Signature.parameters</span></code></a> for any
argument processing purposes.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Arguments for which <a class="reference internal" href="#inspect.Signature.bind" title="inspect.Signature.bind"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind()</span></code></a> or
<a class="reference internal" href="#inspect.Signature.bind_partial" title="inspect.Signature.bind_partial"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind_partial()</span></code></a> relied on a default value are skipped.
However, if needed, use <a class="reference internal" href="#inspect.BoundArguments.apply_defaults" title="inspect.BoundArguments.apply_defaults"><code class="xref py py-meth docutils literal notranslate"><span class="pre">BoundArguments.apply_defaults()</span></code></a> to add
them.</p>
</div>
</dd></dl>
<dl class="attribute">
<dt id="inspect.BoundArguments.args">
<code class="sig-name descname">args</code><a class="headerlink" href="#inspect.BoundArguments.args" title="Permalink to this definition">¶</a></dt>
<dd><p>A tuple of positional arguments values. Dynamically computed from the
<a class="reference internal" href="#inspect.BoundArguments.arguments" title="inspect.BoundArguments.arguments"><code class="xref py py-attr docutils literal notranslate"><span class="pre">arguments</span></code></a> attribute.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.BoundArguments.kwargs">
<code class="sig-name descname">kwargs</code><a class="headerlink" href="#inspect.BoundArguments.kwargs" title="Permalink to this definition">¶</a></dt>
<dd><p>A dict of keyword arguments values. Dynamically computed from the
<a class="reference internal" href="#inspect.BoundArguments.arguments" title="inspect.BoundArguments.arguments"><code class="xref py py-attr docutils literal notranslate"><span class="pre">arguments</span></code></a> attribute.</p>
</dd></dl>
<dl class="attribute">
<dt id="inspect.BoundArguments.signature">
<code class="sig-name descname">signature</code><a class="headerlink" href="#inspect.BoundArguments.signature" title="Permalink to this definition">¶</a></dt>
<dd><p>A reference to the parent <a class="reference internal" href="#inspect.Signature" title="inspect.Signature"><code class="xref py py-class docutils literal notranslate"><span class="pre">Signature</span></code></a> object.</p>
</dd></dl>
<dl class="method">
<dt id="inspect.BoundArguments.apply_defaults">
<code class="sig-name descname">apply_defaults</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#inspect.BoundArguments.apply_defaults" title="Permalink to this definition">¶</a></dt>
<dd><p>Set default values for missing arguments.</p>
<p>For variable-positional arguments (<code class="docutils literal notranslate"><span class="pre">*args</span></code>) the default is an
empty tuple.</p>
<p>For variable-keyword arguments (<code class="docutils literal notranslate"><span class="pre">**kwargs</span></code>) the default is an
empty dict.</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">def</span> <span class="nf">foo</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">=</span><span class="s1">'ham'</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">ba</span> <span class="o">=</span> <span class="n">inspect</span><span class="o">.</span><span class="n">signature</span><span class="p">(</span><span class="n">foo</span><span class="p">)</span><span class="o">.</span><span class="n">bind</span><span class="p">(</span><span class="s1">'spam'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">ba</span><span class="o">.</span><span class="n">apply_defaults</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">ba</span><span class="o">.</span><span class="n">arguments</span>
<span class="go">OrderedDict([('a', 'spam'), ('b', 'ham'), ('args', ())])</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<p>The <a class="reference internal" href="#inspect.BoundArguments.args" title="inspect.BoundArguments.args"><code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code></a> and <a class="reference internal" href="#inspect.BoundArguments.kwargs" title="inspect.BoundArguments.kwargs"><code class="xref py py-attr docutils literal notranslate"><span class="pre">kwargs</span></code></a> properties can be used to invoke
functions:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">b</span><span class="p">):</span>
<span class="o">...</span>
<span class="n">sig</span> <span class="o">=</span> <span class="n">signature</span><span class="p">(</span><span class="n">test</span><span class="p">)</span>
<span class="n">ba</span> <span class="o">=</span> <span class="n">sig</span><span class="o">.</span><span class="n">bind</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="n">b</span><span class="o">=</span><span class="mi">20</span><span class="p">)</span>
<span class="n">test</span><span class="p">(</span><span class="o">*</span><span class="n">ba</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">ba</span><span class="o">.</span><span class="n">kwargs</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<dl class="simple">
<dt><span class="target" id="index-0"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0362"><strong>PEP 362</strong></a> - Function Signature Object.</dt><dd><p>The detailed specification, implementation details and examples.</p>
</dd>
</dl>
</div>
</div>
<div class="section" id="classes-and-functions">
<span id="inspect-classes-functions"></span><h2>Classes and functions<a class="headerlink" href="#classes-and-functions" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="inspect.getclasstree">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getclasstree</code><span class="sig-paren">(</span><em class="sig-param">classes</em>, <em class="sig-param">unique=False</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getclasstree" title="Permalink to this definition">¶</a></dt>
<dd><p>Arrange the given list of classes into a hierarchy of nested lists. Where a
nested list appears, it contains classes derived from the class whose entry
immediately precedes the list. Each entry is a 2-tuple containing a class and a
tuple of its base classes. If the <em>unique</em> argument is true, exactly one entry
appears in the returned structure for each class in the given list. Otherwise,
classes using multiple inheritance and their descendants will appear multiple
times.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getargspec">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getargspec</code><span class="sig-paren">(</span><em class="sig-param">func</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getargspec" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the names and default values of a Python function’s parameters. A
<a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a> <code class="docutils literal notranslate"><span class="pre">ArgSpec(args,</span> <span class="pre">varargs,</span> <span class="pre">keywords,</span> <span class="pre">defaults)</span></code> is
returned. <em>args</em> is a list of the parameter names. <em>varargs</em> and <em>keywords</em>
are the names of the <code class="docutils literal notranslate"><span class="pre">*</span></code> and <code class="docutils literal notranslate"><span class="pre">**</span></code> parameters or <code class="docutils literal notranslate"><span class="pre">None</span></code>. <em>defaults</em> is a
tuple of default argument values or <code class="docutils literal notranslate"><span class="pre">None</span></code> if there are no default
arguments; if this tuple has <em>n</em> elements, they correspond to the last
<em>n</em> elements listed in <em>args</em>.</p>
<div class="deprecated">
<p><span class="versionmodified deprecated">Deprecated since version 3.0: </span>Use <a class="reference internal" href="#inspect.getfullargspec" title="inspect.getfullargspec"><code class="xref py py-func docutils literal notranslate"><span class="pre">getfullargspec()</span></code></a> for an updated API that is usually a drop-in
replacement, but also correctly handles function annotations and
keyword-only parameters.</p>
<p>Alternatively, use <a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a> and
<a class="reference internal" href="#inspect-signature-object"><span class="std std-ref">Signature Object</span></a>, which provide a
more structured introspection API for callables.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getfullargspec">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getfullargspec</code><span class="sig-paren">(</span><em class="sig-param">func</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getfullargspec" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the names and default values of a Python function’s parameters. A
<a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a> is returned:</p>
<p><code class="docutils literal notranslate"><span class="pre">FullArgSpec(args,</span> <span class="pre">varargs,</span> <span class="pre">varkw,</span> <span class="pre">defaults,</span> <span class="pre">kwonlyargs,</span> <span class="pre">kwonlydefaults,</span>
<span class="pre">annotations)</span></code></p>
<p><em>args</em> is a list of the positional parameter names.
<em>varargs</em> is the name of the <code class="docutils literal notranslate"><span class="pre">*</span></code> parameter or <code class="docutils literal notranslate"><span class="pre">None</span></code> if arbitrary
positional arguments are not accepted.
<em>varkw</em> is the name of the <code class="docutils literal notranslate"><span class="pre">**</span></code> parameter or <code class="docutils literal notranslate"><span class="pre">None</span></code> if arbitrary
keyword arguments are not accepted.
<em>defaults</em> is an <em>n</em>-tuple of default argument values corresponding to the
last <em>n</em> positional parameters, or <code class="docutils literal notranslate"><span class="pre">None</span></code> if there are no such defaults
defined.
<em>kwonlyargs</em> is a list of keyword-only parameter names in declaration order.
<em>kwonlydefaults</em> is a dictionary mapping parameter names from <em>kwonlyargs</em>
to the default values used if no argument is supplied.
<em>annotations</em> is a dictionary mapping parameter names to annotations.
The special key <code class="docutils literal notranslate"><span class="pre">"return"</span></code> is used to report the function return value
annotation (if any).</p>
<p>Note that <a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a> and
<a class="reference internal" href="#inspect-signature-object"><span class="std std-ref">Signature Object</span></a> provide the recommended
API for callable introspection, and support additional behaviours (like
positional-only arguments) that are sometimes encountered in extension module
APIs. This function is retained primarily for use in code that needs to
maintain compatibility with the Python 2 <code class="docutils literal notranslate"><span class="pre">inspect</span></code> module API.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.4: </span>This function is now based on <a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a>, but still ignores
<code class="docutils literal notranslate"><span class="pre">__wrapped__</span></code> attributes and includes the already bound first
parameter in the signature output for bound methods.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.6: </span>This method was previously documented as deprecated in favour of
<a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a> in Python 3.5, but that decision has been reversed
in order to restore a clearly supported standard interface for
single-source Python 2/3 code migrating away from the legacy
<a class="reference internal" href="#inspect.getargspec" title="inspect.getargspec"><code class="xref py py-func docutils literal notranslate"><span class="pre">getargspec()</span></code></a> API.</p>
</div>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.7: </span>Python only explicitly guaranteed that it preserved the declaration
order of keyword-only parameters as of version 3.7, although in practice
this order had always been preserved in Python 3.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getargvalues">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getargvalues</code><span class="sig-paren">(</span><em class="sig-param">frame</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getargvalues" title="Permalink to this definition">¶</a></dt>
<dd><p>Get information about arguments passed into a particular frame. A
<a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a> <code class="docutils literal notranslate"><span class="pre">ArgInfo(args,</span> <span class="pre">varargs,</span> <span class="pre">keywords,</span> <span class="pre">locals)</span></code> is
returned. <em>args</em> is a list of the argument names. <em>varargs</em> and <em>keywords</em>
are the names of the <code class="docutils literal notranslate"><span class="pre">*</span></code> and <code class="docutils literal notranslate"><span class="pre">**</span></code> arguments or <code class="docutils literal notranslate"><span class="pre">None</span></code>. <em>locals</em> is the
locals dictionary of the given frame.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This function was inadvertently marked as deprecated in Python 3.5.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.formatargspec">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">formatargspec</code><span class="sig-paren">(</span><em class="sig-param">args</em><span class="optional">[</span>, <em class="sig-param">varargs</em>, <em class="sig-param">varkw</em>, <em class="sig-param">defaults</em>, <em class="sig-param">kwonlyargs</em>, <em class="sig-param">kwonlydefaults</em>, <em class="sig-param">annotations</em><span class="optional">[</span>, <em class="sig-param">formatarg</em>, <em class="sig-param">formatvarargs</em>, <em class="sig-param">formatvarkw</em>, <em class="sig-param">formatvalue</em>, <em class="sig-param">formatreturns</em>, <em class="sig-param">formatannotations</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#inspect.formatargspec" title="Permalink to this definition">¶</a></dt>
<dd><p>Format a pretty argument spec from the values returned by
<a class="reference internal" href="#inspect.getfullargspec" title="inspect.getfullargspec"><code class="xref py py-func docutils literal notranslate"><span class="pre">getfullargspec()</span></code></a>.</p>
<p>The first seven arguments are (<code class="docutils literal notranslate"><span class="pre">args</span></code>, <code class="docutils literal notranslate"><span class="pre">varargs</span></code>, <code class="docutils literal notranslate"><span class="pre">varkw</span></code>,
<code class="docutils literal notranslate"><span class="pre">defaults</span></code>, <code class="docutils literal notranslate"><span class="pre">kwonlyargs</span></code>, <code class="docutils literal notranslate"><span class="pre">kwonlydefaults</span></code>, <code class="docutils literal notranslate"><span class="pre">annotations</span></code>).</p>
<p>The other six arguments are functions that are called to turn argument names,
<code class="docutils literal notranslate"><span class="pre">*</span></code> argument name, <code class="docutils literal notranslate"><span class="pre">**</span></code> argument name, default values, return annotation
and individual annotations into strings, respectively.</p>
<p>For example:</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">inspect</span> <span class="kn">import</span> <span class="n">formatargspec</span><span class="p">,</span> <span class="n">getfullargspec</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">a</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">b</span><span class="p">:</span> <span class="nb">float</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">...</span>
<span class="gp">>>> </span><span class="n">formatargspec</span><span class="p">(</span><span class="o">*</span><span class="n">getfullargspec</span><span class="p">(</span><span class="n">f</span><span class="p">))</span>
<span class="go">'(a: int, b: float)'</span>
</pre></div>
</div>
<div class="deprecated">
<p><span class="versionmodified deprecated">Deprecated since version 3.5: </span>Use <a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a> and
<a class="reference internal" href="#inspect-signature-object"><span class="std std-ref">Signature Object</span></a>, which provide a
better introspecting API for callables.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.formatargvalues">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">formatargvalues</code><span class="sig-paren">(</span><em class="sig-param">args</em><span class="optional">[</span>, <em class="sig-param">varargs</em>, <em class="sig-param">varkw</em>, <em class="sig-param">locals</em>, <em class="sig-param">formatarg</em>, <em class="sig-param">formatvarargs</em>, <em class="sig-param">formatvarkw</em>, <em class="sig-param">formatvalue</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#inspect.formatargvalues" title="Permalink to this definition">¶</a></dt>
<dd><p>Format a pretty argument spec from the four values returned by
<a class="reference internal" href="#inspect.getargvalues" title="inspect.getargvalues"><code class="xref py py-func docutils literal notranslate"><span class="pre">getargvalues()</span></code></a>. The format* arguments are the corresponding optional
formatting functions that are called to turn names and values into strings.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This function was inadvertently marked as deprecated in Python 3.5.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getmro">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getmro</code><span class="sig-paren">(</span><em class="sig-param">cls</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getmro" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a tuple of class cls’s base classes, including cls, in method resolution
order. No class appears more than once in this tuple. Note that the method
resolution order depends on cls’s type. Unless a very peculiar user-defined
metatype is in use, cls will be the first element of the tuple.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getcallargs">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getcallargs</code><span class="sig-paren">(</span><em class="sig-param">func</em>, <em class="sig-param">*args</em>, <em class="sig-param">**kwds</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getcallargs" title="Permalink to this definition">¶</a></dt>
<dd><p>Bind the <em>args</em> and <em>kwds</em> to the argument names of the Python function or
method <em>func</em>, as if it was called with them. For bound methods, bind also the
first argument (typically named <code class="docutils literal notranslate"><span class="pre">self</span></code>) to the associated instance. A dict
is returned, mapping the argument names (including the names of the <code class="docutils literal notranslate"><span class="pre">*</span></code> and
<code class="docutils literal notranslate"><span class="pre">**</span></code> arguments, if any) to their values from <em>args</em> and <em>kwds</em>. In case of
invoking <em>func</em> incorrectly, i.e. whenever <code class="docutils literal notranslate"><span class="pre">func(*args,</span> <span class="pre">**kwds)</span></code> would raise
an exception because of incompatible signature, an exception of the same type
and the same or similar message is raised. For example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">inspect</span> <span class="kn">import</span> <span class="n">getcallargs</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="o">*</span><span class="n">pos</span><span class="p">,</span> <span class="o">**</span><span class="n">named</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">getcallargs</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span> <span class="o">==</span> <span class="p">{</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'named'</span><span class="p">:</span> <span class="p">{},</span> <span class="s1">'b'</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">'pos'</span><span class="p">:</span> <span class="p">(</span><span class="mi">3</span><span class="p">,)}</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">getcallargs</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">a</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">x</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span> <span class="o">==</span> <span class="p">{</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">'named'</span><span class="p">:</span> <span class="p">{</span><span class="s1">'x'</span><span class="p">:</span> <span class="mi">4</span><span class="p">},</span> <span class="s1">'b'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'pos'</span><span class="p">:</span> <span class="p">()}</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">getcallargs</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">TypeError</span>: <span class="n">f() missing 1 required positional argument: 'a'</span>
</pre></div>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
<div class="deprecated">
<p><span class="versionmodified deprecated">Deprecated since version 3.5: </span>Use <a class="reference internal" href="#inspect.Signature.bind" title="inspect.Signature.bind"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind()</span></code></a> and <a class="reference internal" href="#inspect.Signature.bind_partial" title="inspect.Signature.bind_partial"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Signature.bind_partial()</span></code></a> instead.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getclosurevars">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getclosurevars</code><span class="sig-paren">(</span><em class="sig-param">func</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getclosurevars" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the mapping of external name references in a Python function or
method <em>func</em> to their current values. A
<a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a> <code class="docutils literal notranslate"><span class="pre">ClosureVars(nonlocals,</span> <span class="pre">globals,</span> <span class="pre">builtins,</span> <span class="pre">unbound)</span></code>
is returned. <em>nonlocals</em> maps referenced names to lexical closure
variables, <em>globals</em> to the function’s module globals and <em>builtins</em> to
the builtins visible from the function body. <em>unbound</em> is the set of names
referenced in the function that could not be resolved at all given the
current module globals and builtins.</p>
<p><a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised if <em>func</em> is not a Python function or method.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.3.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.unwrap">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">unwrap</code><span class="sig-paren">(</span><em class="sig-param">func</em>, <em class="sig-param">*</em>, <em class="sig-param">stop=None</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.unwrap" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the object wrapped by <em>func</em>. It follows the chain of <code class="xref py py-attr docutils literal notranslate"><span class="pre">__wrapped__</span></code>
attributes returning the last object in the chain.</p>
<p><em>stop</em> is an optional callback accepting an object in the wrapper chain
as its sole argument that allows the unwrapping to be terminated early if
the callback returns a true value. If the callback never returns a true
value, the last object in the chain is returned as usual. For example,
<a class="reference internal" href="#inspect.signature" title="inspect.signature"><code class="xref py py-func docutils literal notranslate"><span class="pre">signature()</span></code></a> uses this to stop unwrapping if any object in the
chain has a <code class="docutils literal notranslate"><span class="pre">__signature__</span></code> attribute defined.</p>
<p><a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> is raised if a cycle is encountered.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.4.</span></p>
</div>
</dd></dl>
</div>
<div class="section" id="the-interpreter-stack">
<span id="inspect-stack"></span><h2>The interpreter stack<a class="headerlink" href="#the-interpreter-stack" title="Permalink to this headline">¶</a></h2>
<p>When the following functions return “frame records,” each record is a
<a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a>
<code class="docutils literal notranslate"><span class="pre">FrameInfo(frame,</span> <span class="pre">filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code>.
The tuple contains the frame object, the filename, the line number of the
current line,
the function name, a list of lines of context from the source code, and the
index of the current line within that list.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>Return a named tuple instead of a tuple.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Keeping references to frame objects, as found in the first element of the frame
records these functions return, can cause your program to create reference
cycles. Once a reference cycle has been created, the lifespan of all objects
which can be accessed from the objects which form the cycle can become much
longer even if Python’s optional cycle detector is enabled. If such cycles must
be created, it is important to ensure they are explicitly broken to avoid the
delayed destruction of objects and increased memory consumption which occurs.</p>
<p>Though the cycle detector will catch these, destruction of the frames (and local
variables) can be made deterministic by removing the cycle in a
<a class="reference internal" href="../reference/compound_stmts.html#finally"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">finally</span></code></a> clause. This is also important if the cycle detector was
disabled when Python was compiled or using <a class="reference internal" href="gc.html#gc.disable" title="gc.disable"><code class="xref py py-func docutils literal notranslate"><span class="pre">gc.disable()</span></code></a>. For example:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">handle_stackframe_without_leak</span><span class="p">():</span>
<span class="n">frame</span> <span class="o">=</span> <span class="n">inspect</span><span class="o">.</span><span class="n">currentframe</span><span class="p">()</span>
<span class="k">try</span><span class="p">:</span>
<span class="c1"># do something with the frame</span>
<span class="k">finally</span><span class="p">:</span>
<span class="k">del</span> <span class="n">frame</span>
</pre></div>
</div>
<p>If you want to keep the frame around (for example to print a traceback
later), you can also break reference cycles by using the
<a class="reference internal" href="../reference/datamodel.html#frame.clear" title="frame.clear"><code class="xref py py-meth docutils literal notranslate"><span class="pre">frame.clear()</span></code></a> method.</p>
</div>
<p>The optional <em>context</em> argument supported by most of these functions specifies
the number of lines of context to return, which are centered around the current
line.</p>
<dl class="function">
<dt id="inspect.getframeinfo">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getframeinfo</code><span class="sig-paren">(</span><em class="sig-param">frame</em>, <em class="sig-param">context=1</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getframeinfo" title="Permalink to this definition">¶</a></dt>
<dd><p>Get information about a frame or traceback object. A <a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuple</span></a>
<code class="docutils literal notranslate"><span class="pre">Traceback(filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code> is returned.</p>
</dd></dl>
<dl class="function">
<dt id="inspect.getouterframes">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getouterframes</code><span class="sig-paren">(</span><em class="sig-param">frame</em>, <em class="sig-param">context=1</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getouterframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Get a list of frame records for a frame and all outer frames. These frames
represent the calls that lead to the creation of <em>frame</em>. The first entry in the
returned list represents <em>frame</em>; the last entry represents the outermost call
on <em>frame</em>’s stack.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>A list of <a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuples</span></a>
<code class="docutils literal notranslate"><span class="pre">FrameInfo(frame,</span> <span class="pre">filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code>
is returned.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getinnerframes">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getinnerframes</code><span class="sig-paren">(</span><em class="sig-param">traceback</em>, <em class="sig-param">context=1</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getinnerframes" title="Permalink to this definition">¶</a></dt>
<dd><p>Get a list of frame records for a traceback’s frame and all inner frames. These
frames represent calls made as a consequence of <em>frame</em>. The first entry in the
list represents <em>traceback</em>; the last entry represents where the exception was
raised.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>A list of <a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuples</span></a>
<code class="docutils literal notranslate"><span class="pre">FrameInfo(frame,</span> <span class="pre">filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code>
is returned.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.currentframe">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">currentframe</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#inspect.currentframe" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the frame object for the caller’s stack frame.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> This function relies on Python stack frame support in the interpreter,
which isn’t guaranteed to exist in all implementations of Python. If
running in an implementation without Python stack frame support this
function returns <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.stack">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">stack</code><span class="sig-paren">(</span><em class="sig-param">context=1</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.stack" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a list of frame records for the caller’s stack. The first entry in the
returned list represents the caller; the last entry represents the outermost
call on the stack.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>A list of <a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuples</span></a>
<code class="docutils literal notranslate"><span class="pre">FrameInfo(frame,</span> <span class="pre">filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code>
is returned.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.trace">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">trace</code><span class="sig-paren">(</span><em class="sig-param">context=1</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.trace" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a list of frame records for the stack between the current frame and the
frame in which an exception currently being handled was raised in. The first
entry in the list represents the caller; the last entry represents where the
exception was raised.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.5: </span>A list of <a class="reference internal" href="../glossary.html#term-named-tuple"><span class="xref std std-term">named tuples</span></a>
<code class="docutils literal notranslate"><span class="pre">FrameInfo(frame,</span> <span class="pre">filename,</span> <span class="pre">lineno,</span> <span class="pre">function,</span> <span class="pre">code_context,</span> <span class="pre">index)</span></code>
is returned.</p>
</div>
</dd></dl>
</div>
<div class="section" id="fetching-attributes-statically">
<h2>Fetching attributes statically<a class="headerlink" href="#fetching-attributes-statically" title="Permalink to this headline">¶</a></h2>
<p>Both <a class="reference internal" href="functions.html#getattr" title="getattr"><code class="xref py py-func docutils literal notranslate"><span class="pre">getattr()</span></code></a> and <a class="reference internal" href="functions.html#hasattr" title="hasattr"><code class="xref py py-func docutils literal notranslate"><span class="pre">hasattr()</span></code></a> can trigger code execution when
fetching or checking for the existence of attributes. Descriptors, like
properties, will be invoked and <a class="reference internal" href="../reference/datamodel.html#object.__getattr__" title="object.__getattr__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getattr__()</span></code></a> and <a class="reference internal" href="../reference/datamodel.html#object.__getattribute__" title="object.__getattribute__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getattribute__()</span></code></a>
may be called.</p>
<p>For cases where you want passive introspection, like documentation tools, this
can be inconvenient. <a class="reference internal" href="#inspect.getattr_static" title="inspect.getattr_static"><code class="xref py py-func docutils literal notranslate"><span class="pre">getattr_static()</span></code></a> has the same signature as <a class="reference internal" href="functions.html#getattr" title="getattr"><code class="xref py py-func docutils literal notranslate"><span class="pre">getattr()</span></code></a>
but avoids executing code when it fetches attributes.</p>
<dl class="function">
<dt id="inspect.getattr_static">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getattr_static</code><span class="sig-paren">(</span><em class="sig-param">obj</em>, <em class="sig-param">attr</em>, <em class="sig-param">default=None</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getattr_static" title="Permalink to this definition">¶</a></dt>
<dd><p>Retrieve attributes without triggering dynamic lookup via the
descriptor protocol, <a class="reference internal" href="../reference/datamodel.html#object.__getattr__" title="object.__getattr__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getattr__()</span></code></a> or <a class="reference internal" href="../reference/datamodel.html#object.__getattribute__" title="object.__getattribute__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getattribute__()</span></code></a>.</p>
<p>Note: this function may not be able to retrieve all attributes
that getattr can fetch (like dynamically created attributes)
and may find attributes that getattr can’t (like descriptors
that raise AttributeError). It can also return descriptors objects
instead of instance members.</p>
<p>If the instance <a class="reference internal" href="stdtypes.html#object.__dict__" title="object.__dict__"><code class="xref py py-attr docutils literal notranslate"><span class="pre">__dict__</span></code></a> is shadowed by another member (for
example a property) then this function will be unable to find instance
members.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>
<p><a class="reference internal" href="#inspect.getattr_static" title="inspect.getattr_static"><code class="xref py py-func docutils literal notranslate"><span class="pre">getattr_static()</span></code></a> does not resolve descriptors, for example slot descriptors or
getset descriptors on objects implemented in C. The descriptor object
is returned instead of the underlying attribute.</p>
<p>You can handle these with code like the following. Note that
for arbitrary getset descriptors invoking these may trigger
code execution:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># example code for resolving the builtin descriptor types</span>
<span class="k">class</span> <span class="nc">_foo</span><span class="p">:</span>
<span class="vm">__slots__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'foo'</span><span class="p">]</span>
<span class="n">slot_descriptor</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="n">_foo</span><span class="o">.</span><span class="n">foo</span><span class="p">)</span>
<span class="n">getset_descriptor</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="nb">open</span><span class="p">(</span><span class="vm">__file__</span><span class="p">))</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">wrapper_descriptor</span> <span class="o">=</span> <span class="nb">type</span><span class="p">(</span><span class="nb">str</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">[</span><span class="s1">'__add__'</span><span class="p">])</span>
<span class="n">descriptor_types</span> <span class="o">=</span> <span class="p">(</span><span class="n">slot_descriptor</span><span class="p">,</span> <span class="n">getset_descriptor</span><span class="p">,</span> <span class="n">wrapper_descriptor</span><span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">getattr_static</span><span class="p">(</span><span class="n">some_object</span><span class="p">,</span> <span class="s1">'foo'</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">result</span><span class="p">)</span> <span class="ow">in</span> <span class="n">descriptor_types</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">result</span><span class="o">.</span><span class="fm">__get__</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="c1"># descriptors can raise AttributeError to</span>
<span class="c1"># indicate there is no underlying value</span>
<span class="c1"># in which case the descriptor itself will</span>
<span class="c1"># have to do</span>
<span class="k">pass</span>
</pre></div>
</div>
</div>
<div class="section" id="current-state-of-generators-and-coroutines">
<h2>Current State of Generators and Coroutines<a class="headerlink" href="#current-state-of-generators-and-coroutines" title="Permalink to this headline">¶</a></h2>
<p>When implementing coroutine schedulers and for other advanced uses of
generators, it is useful to determine whether a generator is currently
executing, is waiting to start or resume or execution, or has already
terminated. <a class="reference internal" href="#inspect.getgeneratorstate" title="inspect.getgeneratorstate"><code class="xref py py-func docutils literal notranslate"><span class="pre">getgeneratorstate()</span></code></a> allows the current state of a
generator to be determined easily.</p>
<dl class="function">
<dt id="inspect.getgeneratorstate">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getgeneratorstate</code><span class="sig-paren">(</span><em class="sig-param">generator</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getgeneratorstate" title="Permalink to this definition">¶</a></dt>
<dd><p>Get current state of a generator-iterator.</p>
<dl class="simple">
<dt>Possible states are:</dt><dd><ul class="simple">
<li><p>GEN_CREATED: Waiting to start execution.</p></li>
<li><p>GEN_RUNNING: Currently being executed by the interpreter.</p></li>
<li><p>GEN_SUSPENDED: Currently suspended at a yield expression.</p></li>
<li><p>GEN_CLOSED: Execution has completed.</p></li>
</ul>
</dd>
</dl>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.2.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getcoroutinestate">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getcoroutinestate</code><span class="sig-paren">(</span><em class="sig-param">coroutine</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getcoroutinestate" title="Permalink to this definition">¶</a></dt>
<dd><p>Get current state of a coroutine object. The function is intended to be
used with coroutine objects created by <a class="reference internal" href="../reference/compound_stmts.html#async-def"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">async</span> <span class="pre">def</span></code></a> functions, but
will accept any coroutine-like object that has <code class="docutils literal notranslate"><span class="pre">cr_running</span></code> and
<code class="docutils literal notranslate"><span class="pre">cr_frame</span></code> attributes.</p>
<dl class="simple">
<dt>Possible states are:</dt><dd><ul class="simple">
<li><p>CORO_CREATED: Waiting to start execution.</p></li>
<li><p>CORO_RUNNING: Currently being executed by the interpreter.</p></li>
<li><p>CORO_SUSPENDED: Currently suspended at an await expression.</p></li>
<li><p>CORO_CLOSED: Execution has completed.</p></li>
</ul>
</dd>
</dl>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<p>The current internal state of the generator can also be queried. This is
mostly useful for testing purposes, to ensure that internal state is being
updated as expected:</p>
<dl class="function">
<dt id="inspect.getgeneratorlocals">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getgeneratorlocals</code><span class="sig-paren">(</span><em class="sig-param">generator</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getgeneratorlocals" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the mapping of live local variables in <em>generator</em> to their current
values. A dictionary is returned that maps from variable names to values.
This is the equivalent of calling <a class="reference internal" href="functions.html#locals" title="locals"><code class="xref py py-func docutils literal notranslate"><span class="pre">locals()</span></code></a> in the body of the
generator, and all the same caveats apply.</p>
<p>If <em>generator</em> is a <a class="reference internal" href="../glossary.html#term-generator"><span class="xref std std-term">generator</span></a> with no currently associated frame,
then an empty dictionary is returned. <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised if
<em>generator</em> is not a Python generator object.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> This function relies on the generator exposing a Python stack frame
for introspection, which isn’t guaranteed to be the case in all
implementations of Python. In such cases, this function will always
return an empty dictionary.</p>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.3.</span></p>
</div>
</dd></dl>
<dl class="function">
<dt id="inspect.getcoroutinelocals">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">getcoroutinelocals</code><span class="sig-paren">(</span><em class="sig-param">coroutine</em><span class="sig-paren">)</span><a class="headerlink" href="#inspect.getcoroutinelocals" title="Permalink to this definition">¶</a></dt>
<dd><p>This function is analogous to <a class="reference internal" href="#inspect.getgeneratorlocals" title="inspect.getgeneratorlocals"><code class="xref py py-func docutils literal notranslate"><span class="pre">getgeneratorlocals()</span></code></a>, but
works for coroutine objects created by <a class="reference internal" href="../reference/compound_stmts.html#async-def"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">async</span> <span class="pre">def</span></code></a> functions.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
</div>
<div class="section" id="code-objects-bit-flags">
<span id="inspect-module-co-flags"></span><h2>Code Objects Bit Flags<a class="headerlink" href="#code-objects-bit-flags" title="Permalink to this headline">¶</a></h2>
<p>Python code objects have a <code class="docutils literal notranslate"><span class="pre">co_flags</span></code> attribute, which is a bitmap of
the following flags:</p>
<dl class="data">
<dt id="inspect.CO_OPTIMIZED">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_OPTIMIZED</code><a class="headerlink" href="#inspect.CO_OPTIMIZED" title="Permalink to this definition">¶</a></dt>
<dd><p>The code object is optimized, using fast locals.</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_NEWLOCALS">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_NEWLOCALS</code><a class="headerlink" href="#inspect.CO_NEWLOCALS" title="Permalink to this definition">¶</a></dt>
<dd><p>If set, a new dict will be created for the frame’s <code class="docutils literal notranslate"><span class="pre">f_locals</span></code> when
the code object is executed.</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_VARARGS">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_VARARGS</code><a class="headerlink" href="#inspect.CO_VARARGS" title="Permalink to this definition">¶</a></dt>
<dd><p>The code object has a variable positional parameter (<code class="docutils literal notranslate"><span class="pre">*args</span></code>-like).</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_VARKEYWORDS">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_VARKEYWORDS</code><a class="headerlink" href="#inspect.CO_VARKEYWORDS" title="Permalink to this definition">¶</a></dt>
<dd><p>The code object has a variable keyword parameter (<code class="docutils literal notranslate"><span class="pre">**kwargs</span></code>-like).</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_NESTED">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_NESTED</code><a class="headerlink" href="#inspect.CO_NESTED" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is set when the code object is a nested function.</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_GENERATOR">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_GENERATOR</code><a class="headerlink" href="#inspect.CO_GENERATOR" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is set when the code object is a generator function, i.e.
a generator object is returned when the code object is executed.</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_NOFREE">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_NOFREE</code><a class="headerlink" href="#inspect.CO_NOFREE" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is set if there are no free or cell variables.</p>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_COROUTINE">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_COROUTINE</code><a class="headerlink" href="#inspect.CO_COROUTINE" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is set when the code object is a coroutine function.
When the code object is executed it returns a coroutine object.
See <span class="target" id="index-1"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0492"><strong>PEP 492</strong></a> for more details.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_ITERABLE_COROUTINE">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_ITERABLE_COROUTINE</code><a class="headerlink" href="#inspect.CO_ITERABLE_COROUTINE" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is used to transform generators into generator-based
coroutines. Generator objects with this flag can be used in
<code class="docutils literal notranslate"><span class="pre">await</span></code> expression, and can <code class="docutils literal notranslate"><span class="pre">yield</span> <span class="pre">from</span></code> coroutine objects.
See <span class="target" id="index-2"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0492"><strong>PEP 492</strong></a> for more details.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.5.</span></p>
</div>
</dd></dl>
<dl class="data">
<dt id="inspect.CO_ASYNC_GENERATOR">
<code class="sig-prename descclassname">inspect.</code><code class="sig-name descname">CO_ASYNC_GENERATOR</code><a class="headerlink" href="#inspect.CO_ASYNC_GENERATOR" title="Permalink to this definition">¶</a></dt>
<dd><p>The flag is set when the code object is an asynchronous generator
function. When the code object is executed it returns an
asynchronous generator object. See <span class="target" id="index-3"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0525"><strong>PEP 525</strong></a> for more details.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.6.</span></p>
</div>
</dd></dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The flags are specific to CPython, and may not be defined in other
Python implementations. Furthermore, the flags are an implementation
detail, and can be removed or deprecated in future Python releases.
It’s recommended to use public APIs from the <a class="reference internal" href="#module-inspect" title="inspect: Extract information and source code from live objects."><code class="xref py py-mod docutils literal notranslate"><span class="pre">inspect</span></code></a> module
for any introspection needs.</p>
</div>
</div>
<div class="section" id="command-line-interface">
<span id="inspect-module-cli"></span><h2>Command Line Interface<a class="headerlink" href="#command-line-interface" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="#module-inspect" title="inspect: Extract information and source code from live objects."><code class="xref py py-mod docutils literal notranslate"><span class="pre">inspect</span></code></a> module also provides a basic introspection capability
from the command line.</p>
<p>By default, accepts the name of a module and prints the source of that
module. A class or function within the module can be printed instead by
appended a colon and the qualified name of the target object.</p>
<dl class="cmdoption">
<dt id="cmdoption-inspect-details">
<code class="sig-name descname">--details</code><code class="sig-prename descclassname"></code><a class="headerlink" href="#cmdoption-inspect-details" title="Permalink to this definition">¶</a></dt>
<dd><p>Print information about the specified object rather than the source code</p>
</dd></dl>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="../contents.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">inspect</span></code> — Inspect live objects</a><ul>
<li><a class="reference internal" href="#types-and-members">Types and members</a></li>
<li><a class="reference internal" href="#retrieving-source-code">Retrieving source code</a></li>
<li><a class="reference internal" href="#introspecting-callables-with-the-signature-object">Introspecting callables with the Signature object</a></li>
<li><a class="reference internal" href="#classes-and-functions">Classes and functions</a></li>
<li><a class="reference internal" href="#the-interpreter-stack">The interpreter stack</a></li>
<li><a class="reference internal" href="#fetching-attributes-statically">Fetching attributes statically</a></li>
<li><a class="reference internal" href="#current-state-of-generators-and-coroutines">Current State of Generators and Coroutines</a></li>
<li><a class="reference internal" href="#code-objects-bit-flags">Code Objects Bit Flags</a></li>
<li><a class="reference internal" href="#command-line-interface">Command Line Interface</a></li>
</ul>
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