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  <div class="section" id="module-dis">
<span id="dis-disassembler-for-python-bytecode"></span><h1>30.12. <a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><tt class="xref py py-mod docutils literal"><span class="pre">dis</span></tt></a> &#8212; Disassembler for Python bytecode<a class="headerlink" href="#module-dis" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/3.2/Lib/dis.py">Lib/dis.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><tt class="xref py py-mod docutils literal"><span class="pre">dis</span></tt></a> module supports the analysis of CPython <a class="reference internal" href="../glossary.html#term-bytecode"><em class="xref std std-term">bytecode</em></a> by
disassembling it. The CPython bytecode which this module takes as an
input is defined in the file <tt class="file docutils literal"><span class="pre">Include/opcode.h</span></tt> and used by the compiler
and the interpreter.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> Bytecode is an implementation detail of the CPython interpreter.  No
guarantees are made that bytecode will not be added, removed, or changed
between versions of Python.  Use of this module should not be considered to
work across Python VMs or Python releases.</p>
</div>
<p>Example: Given the function <tt class="xref py py-func docutils literal"><span class="pre">myfunc()</span></tt>:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="k">def</span> <span class="nf">myfunc</span><span class="p">(</span><span class="n">alist</span><span class="p">):</span>
    <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">alist</span><span class="p">)</span>
</pre></div>
</div>
<p>the following command can be used to get the disassembly of <tt class="xref py py-func docutils literal"><span class="pre">myfunc()</span></tt>:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">dis</span><span class="o">.</span><span class="n">dis</span><span class="p">(</span><span class="n">myfunc</span><span class="p">)</span>
<span class="go">  2           0 LOAD_GLOBAL              0 (len)</span>
<span class="go">              3 LOAD_FAST                0 (alist)</span>
<span class="go">              6 CALL_FUNCTION            1</span>
<span class="go">              9 RETURN_VALUE</span>
</pre></div>
</div>
<p>(The &#8220;2&#8221; is a line number).</p>
<p>The <a class="reference internal" href="#module-dis" title="dis: Disassembler for Python bytecode."><tt class="xref py py-mod docutils literal"><span class="pre">dis</span></tt></a> module defines the following functions and constants:</p>
<dl class="function">
<dt id="dis.code_info">
<tt class="descclassname">dis.</tt><tt class="descname">code_info</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#dis.code_info" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a formatted multi-line string with detailed code object information
for the supplied function, method, source code string or code object.</p>
<p>Note that the exact contents of code info strings are highly implementation
dependent and they may change arbitrarily across Python VMs or Python
releases.</p>
<p class="versionadded">
<span class="versionmodified">New in version 3.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="dis.show_code">
<tt class="descclassname">dis.</tt><tt class="descname">show_code</tt><big>(</big><em>x</em><big>)</big><a class="headerlink" href="#dis.show_code" title="Permalink to this definition">¶</a></dt>
<dd><p>Print detailed code object information for the supplied function, method,
source code string or code object to stdout.</p>
<p>This is a convenient shorthand for <tt class="docutils literal"><span class="pre">print(code_info(x))</span></tt>, intended for
interactive exploration at the interpreter prompt.</p>
<p class="versionadded">
<span class="versionmodified">New in version 3.2.</span></p>
</dd></dl>

<dl class="function">
<dt id="dis.dis">
<tt class="descclassname">dis.</tt><tt class="descname">dis</tt><big>(</big><em>x=None</em><big>)</big><a class="headerlink" href="#dis.dis" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble the <em>x</em> object.  <em>x</em> can denote either a module, a class, a
method, a function, a code object, a string of source code or a byte sequence
of raw bytecode.  For a module, it disassembles all functions.  For a class,
it disassembles all methods.  For a code object or sequence of raw bytecode,
it prints one line per bytecode instruction.  Strings are first compiled to
code objects with the <a class="reference internal" href="functions.html#compile" title="compile"><tt class="xref py py-func docutils literal"><span class="pre">compile()</span></tt></a> built-in function before being
disassembled.  If no object is provided, this function disassembles the last
traceback.</p>
</dd></dl>

<dl class="function">
<dt id="dis.distb">
<tt class="descclassname">dis.</tt><tt class="descname">distb</tt><big>(</big><em>tb=None</em><big>)</big><a class="headerlink" href="#dis.distb" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble the top-of-stack function of a traceback, using the last
traceback if none was passed.  The instruction causing the exception is
indicated.</p>
</dd></dl>

<dl class="function">
<dt id="dis.disassemble">
<tt class="descclassname">dis.</tt><tt class="descname">disassemble</tt><big>(</big><em>code</em>, <em>lasti=-1</em><big>)</big><a class="headerlink" href="#dis.disassemble" title="Permalink to this definition">¶</a></dt>
<dt id="dis.disco">
<tt class="descclassname">dis.</tt><tt class="descname">disco</tt><big>(</big><em>code</em>, <em>lasti=-1</em><big>)</big><a class="headerlink" href="#dis.disco" title="Permalink to this definition">¶</a></dt>
<dd><p>Disassemble a code object, indicating the last instruction if <em>lasti</em> was
provided.  The output is divided in the following columns:</p>
<ol class="arabic simple">
<li>the line number, for the first instruction of each line</li>
<li>the current instruction, indicated as <tt class="docutils literal"><span class="pre">--&gt;</span></tt>,</li>
<li>a labelled instruction, indicated with <tt class="docutils literal"><span class="pre">&gt;&gt;</span></tt>,</li>
<li>the address of the instruction,</li>
<li>the operation code name,</li>
<li>operation parameters, and</li>
<li>interpretation of the parameters in parentheses.</li>
</ol>
<p>The parameter interpretation recognizes local and global variable names,
constant values, branch targets, and compare operators.</p>
</dd></dl>

<dl class="function">
<dt id="dis.findlinestarts">
<tt class="descclassname">dis.</tt><tt class="descname">findlinestarts</tt><big>(</big><em>code</em><big>)</big><a class="headerlink" href="#dis.findlinestarts" title="Permalink to this definition">¶</a></dt>
<dd><p>This generator function uses the <tt class="docutils literal"><span class="pre">co_firstlineno</span></tt> and <tt class="docutils literal"><span class="pre">co_lnotab</span></tt>
attributes of the code object <em>code</em> to find the offsets which are starts of
lines in the source code.  They are generated as <tt class="docutils literal"><span class="pre">(offset,</span> <span class="pre">lineno)</span></tt> pairs.</p>
</dd></dl>

<dl class="function">
<dt id="dis.findlabels">
<tt class="descclassname">dis.</tt><tt class="descname">findlabels</tt><big>(</big><em>code</em><big>)</big><a class="headerlink" href="#dis.findlabels" title="Permalink to this definition">¶</a></dt>
<dd><p>Detect all offsets in the code object <em>code</em> which are jump targets, and
return a list of these offsets.</p>
</dd></dl>

<dl class="data">
<dt id="dis.opname">
<tt class="descclassname">dis.</tt><tt class="descname">opname</tt><a class="headerlink" href="#dis.opname" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of operation names, indexable using the bytecode.</p>
</dd></dl>

<dl class="data">
<dt id="dis.opmap">
<tt class="descclassname">dis.</tt><tt class="descname">opmap</tt><a class="headerlink" href="#dis.opmap" title="Permalink to this definition">¶</a></dt>
<dd><p>Dictionary mapping operation names to bytecodes.</p>
</dd></dl>

<dl class="data">
<dt id="dis.cmp_op">
<tt class="descclassname">dis.</tt><tt class="descname">cmp_op</tt><a class="headerlink" href="#dis.cmp_op" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of all compare operation names.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasconst">
<tt class="descclassname">dis.</tt><tt class="descname">hasconst</tt><a class="headerlink" href="#dis.hasconst" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that have a constant parameter.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasfree">
<tt class="descclassname">dis.</tt><tt class="descname">hasfree</tt><a class="headerlink" href="#dis.hasfree" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access a free variable.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasname">
<tt class="descclassname">dis.</tt><tt class="descname">hasname</tt><a class="headerlink" href="#dis.hasname" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access an attribute by name.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasjrel">
<tt class="descclassname">dis.</tt><tt class="descname">hasjrel</tt><a class="headerlink" href="#dis.hasjrel" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that have a relative jump target.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hasjabs">
<tt class="descclassname">dis.</tt><tt class="descname">hasjabs</tt><a class="headerlink" href="#dis.hasjabs" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that have an absolute jump target.</p>
</dd></dl>

<dl class="data">
<dt id="dis.haslocal">
<tt class="descclassname">dis.</tt><tt class="descname">haslocal</tt><a class="headerlink" href="#dis.haslocal" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes that access a local variable.</p>
</dd></dl>

<dl class="data">
<dt id="dis.hascompare">
<tt class="descclassname">dis.</tt><tt class="descname">hascompare</tt><a class="headerlink" href="#dis.hascompare" title="Permalink to this definition">¶</a></dt>
<dd><p>Sequence of bytecodes of Boolean operations.</p>
</dd></dl>

<div class="section" id="python-bytecode-instructions">
<span id="bytecodes"></span><h2>30.12.1. Python Bytecode Instructions<a class="headerlink" href="#python-bytecode-instructions" title="Permalink to this headline">¶</a></h2>
<p>The Python compiler currently generates the following bytecode instructions.</p>
<p><strong>General instructions</strong></p>
<dl class="opcode">
<dt id="opcode-STOP_CODE">
<tt class="descname">STOP_CODE</tt><a class="headerlink" href="#opcode-STOP_CODE" title="Permalink to this definition">¶</a></dt>
<dd><p>Indicates end-of-code to the compiler, not used by the interpreter.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-NOP">
<tt class="descname">NOP</tt><a class="headerlink" href="#opcode-NOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Do nothing code.  Used as a placeholder by the bytecode optimizer.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_TOP">
<tt class="descname">POP_TOP</tt><a class="headerlink" href="#opcode-POP_TOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes the top-of-stack (TOS) item.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-ROT_TWO">
<tt class="descname">ROT_TWO</tt><a class="headerlink" href="#opcode-ROT_TWO" title="Permalink to this definition">¶</a></dt>
<dd><p>Swaps the two top-most stack items.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-ROT_THREE">
<tt class="descname">ROT_THREE</tt><a class="headerlink" href="#opcode-ROT_THREE" title="Permalink to this definition">¶</a></dt>
<dd><p>Lifts second and third stack item one position up, moves top down to position
three.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DUP_TOP">
<tt class="descname">DUP_TOP</tt><a class="headerlink" href="#opcode-DUP_TOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Duplicates the reference on top of the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DUP_TOP_TWO">
<tt class="descname">DUP_TOP_TWO</tt><a class="headerlink" href="#opcode-DUP_TOP_TWO" title="Permalink to this definition">¶</a></dt>
<dd><p>Duplicates the two references on top of the stack, leaving them in the
same order.</p>
</dd></dl>

<p><strong>Unary operations</strong></p>
<p>Unary operations take the top of the stack, apply the operation, and push the
result back on the stack.</p>
<dl class="opcode">
<dt id="opcode-UNARY_POSITIVE">
<tt class="descname">UNARY_POSITIVE</tt><a class="headerlink" href="#opcode-UNARY_POSITIVE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">+TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_NEGATIVE">
<tt class="descname">UNARY_NEGATIVE</tt><a class="headerlink" href="#opcode-UNARY_NEGATIVE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">-TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_NOT">
<tt class="descname">UNARY_NOT</tt><a class="headerlink" href="#opcode-UNARY_NOT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">not</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNARY_INVERT">
<tt class="descname">UNARY_INVERT</tt><a class="headerlink" href="#opcode-UNARY_INVERT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">~TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-GET_ITER">
<tt class="descname">GET_ITER</tt><a class="headerlink" href="#opcode-GET_ITER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">iter(TOS)</span></tt>.</p>
</dd></dl>

<p><strong>Binary operations</strong></p>
<p>Binary operations remove the top of the stack (TOS) and the second top-most
stack item (TOS1) from the stack.  They perform the operation, and put the
result back on the stack.</p>
<dl class="opcode">
<dt id="opcode-BINARY_POWER">
<tt class="descname">BINARY_POWER</tt><a class="headerlink" href="#opcode-BINARY_POWER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">**</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_MULTIPLY">
<tt class="descname">BINARY_MULTIPLY</tt><a class="headerlink" href="#opcode-BINARY_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">*</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_FLOOR_DIVIDE">
<tt class="descname">BINARY_FLOOR_DIVIDE</tt><a class="headerlink" href="#opcode-BINARY_FLOOR_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">//</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_TRUE_DIVIDE">
<tt class="descname">BINARY_TRUE_DIVIDE</tt><a class="headerlink" href="#opcode-BINARY_TRUE_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">/</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_MODULO">
<tt class="descname">BINARY_MODULO</tt><a class="headerlink" href="#opcode-BINARY_MODULO" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">%</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_ADD">
<tt class="descname">BINARY_ADD</tt><a class="headerlink" href="#opcode-BINARY_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">+</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_SUBTRACT">
<tt class="descname">BINARY_SUBTRACT</tt><a class="headerlink" href="#opcode-BINARY_SUBTRACT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">-</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_SUBSCR">
<tt class="descname">BINARY_SUBSCR</tt><a class="headerlink" href="#opcode-BINARY_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1[TOS]</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_LSHIFT">
<tt class="descname">BINARY_LSHIFT</tt><a class="headerlink" href="#opcode-BINARY_LSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&lt;&lt;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_RSHIFT">
<tt class="descname">BINARY_RSHIFT</tt><a class="headerlink" href="#opcode-BINARY_RSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&gt;&gt;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_AND">
<tt class="descname">BINARY_AND</tt><a class="headerlink" href="#opcode-BINARY_AND" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&amp;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_XOR">
<tt class="descname">BINARY_XOR</tt><a class="headerlink" href="#opcode-BINARY_XOR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">^</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BINARY_OR">
<tt class="descname">BINARY_OR</tt><a class="headerlink" href="#opcode-BINARY_OR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">|</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<p><strong>In-place operations</strong></p>
<p>In-place operations are like binary operations, in that they remove TOS and
TOS1, and push the result back on the stack, but the operation is done in-place
when TOS1 supports it, and the resulting TOS may be (but does not have to be)
the original TOS1.</p>
<dl class="opcode">
<dt id="opcode-INPLACE_POWER">
<tt class="descname">INPLACE_POWER</tt><a class="headerlink" href="#opcode-INPLACE_POWER" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">**</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_MULTIPLY">
<tt class="descname">INPLACE_MULTIPLY</tt><a class="headerlink" href="#opcode-INPLACE_MULTIPLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">*</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_FLOOR_DIVIDE">
<tt class="descname">INPLACE_FLOOR_DIVIDE</tt><a class="headerlink" href="#opcode-INPLACE_FLOOR_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">//</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_TRUE_DIVIDE">
<tt class="descname">INPLACE_TRUE_DIVIDE</tt><a class="headerlink" href="#opcode-INPLACE_TRUE_DIVIDE" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">/</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_MODULO">
<tt class="descname">INPLACE_MODULO</tt><a class="headerlink" href="#opcode-INPLACE_MODULO" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">%</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_ADD">
<tt class="descname">INPLACE_ADD</tt><a class="headerlink" href="#opcode-INPLACE_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">+</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_SUBTRACT">
<tt class="descname">INPLACE_SUBTRACT</tt><a class="headerlink" href="#opcode-INPLACE_SUBTRACT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">-</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_LSHIFT">
<tt class="descname">INPLACE_LSHIFT</tt><a class="headerlink" href="#opcode-INPLACE_LSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&lt;&lt;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_RSHIFT">
<tt class="descname">INPLACE_RSHIFT</tt><a class="headerlink" href="#opcode-INPLACE_RSHIFT" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&gt;&gt;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_AND">
<tt class="descname">INPLACE_AND</tt><a class="headerlink" href="#opcode-INPLACE_AND" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">&amp;</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_XOR">
<tt class="descname">INPLACE_XOR</tt><a class="headerlink" href="#opcode-INPLACE_XOR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">^</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-INPLACE_OR">
<tt class="descname">INPLACE_OR</tt><a class="headerlink" href="#opcode-INPLACE_OR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements in-place <tt class="docutils literal"><span class="pre">TOS</span> <span class="pre">=</span> <span class="pre">TOS1</span> <span class="pre">|</span> <span class="pre">TOS</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_SUBSCR">
<tt class="descname">STORE_SUBSCR</tt><a class="headerlink" href="#opcode-STORE_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS1[TOS]</span> <span class="pre">=</span> <span class="pre">TOS2</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_SUBSCR">
<tt class="descname">DELETE_SUBSCR</tt><a class="headerlink" href="#opcode-DELETE_SUBSCR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">del</span> <span class="pre">TOS1[TOS]</span></tt>.</p>
</dd></dl>

<p><strong>Miscellaneous opcodes</strong></p>
<dl class="opcode">
<dt id="opcode-PRINT_EXPR">
<tt class="descname">PRINT_EXPR</tt><a class="headerlink" href="#opcode-PRINT_EXPR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements the expression statement for the interactive mode.  TOS is removed
from the stack and printed.  In non-interactive mode, an expression statement is
terminated with <tt class="docutils literal"><span class="pre">POP_STACK</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BREAK_LOOP">
<tt class="descname">BREAK_LOOP</tt><a class="headerlink" href="#opcode-BREAK_LOOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Terminates a loop due to a <a class="reference internal" href="../reference/simple_stmts.html#break"><tt class="xref std std-keyword docutils literal"><span class="pre">break</span></tt></a> statement.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CONTINUE_LOOP">
<tt class="descname">CONTINUE_LOOP</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-CONTINUE_LOOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Continues a loop due to a <a class="reference internal" href="../reference/simple_stmts.html#continue"><tt class="xref std std-keyword docutils literal"><span class="pre">continue</span></tt></a> statement.  <em>target</em> is the
address to jump to (which should be a <tt class="docutils literal"><span class="pre">FOR_ITER</span></tt> instruction).</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SET_ADD">
<tt class="descname">SET_ADD</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-SET_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <tt class="docutils literal"><span class="pre">set.add(TOS1[-i],</span> <span class="pre">TOS)</span></tt>.  Used to implement set comprehensions.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LIST_APPEND">
<tt class="descname">LIST_APPEND</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-LIST_APPEND" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <tt class="docutils literal"><span class="pre">list.append(TOS[-i],</span> <span class="pre">TOS)</span></tt>.  Used to implement list comprehensions.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-MAP_ADD">
<tt class="descname">MAP_ADD</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-MAP_ADD" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls <tt class="docutils literal"><span class="pre">dict.setitem(TOS1[-i],</span> <span class="pre">TOS,</span> <span class="pre">TOS1)</span></tt>.  Used to implement dict
comprehensions.</p>
</dd></dl>

<p>For all of the SET_ADD, LIST_APPEND and MAP_ADD instructions, while the
added value or key/value pair is popped off, the container object remains on
the stack so that it is available for further iterations of the loop.</p>
<dl class="opcode">
<dt id="opcode-RETURN_VALUE">
<tt class="descname">RETURN_VALUE</tt><a class="headerlink" href="#opcode-RETURN_VALUE" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns with TOS to the caller of the function.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-YIELD_VALUE">
<tt class="descname">YIELD_VALUE</tt><a class="headerlink" href="#opcode-YIELD_VALUE" title="Permalink to this definition">¶</a></dt>
<dd><p>Pops <tt class="docutils literal"><span class="pre">TOS</span></tt> and yields it from a <a class="reference internal" href="../glossary.html#term-generator"><em class="xref std std-term">generator</em></a>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_STAR">
<tt class="descname">IMPORT_STAR</tt><a class="headerlink" href="#opcode-IMPORT_STAR" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads all symbols not starting with <tt class="docutils literal"><span class="pre">'_'</span></tt> directly from the module TOS to the
local namespace. The module is popped after loading all names. This opcode
implements <tt class="docutils literal"><span class="pre">from</span> <span class="pre">module</span> <span class="pre">import</span> <span class="pre">*</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_BLOCK">
<tt class="descname">POP_BLOCK</tt><a class="headerlink" href="#opcode-POP_BLOCK" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes one block from the block stack.  Per frame, there is a  stack of blocks,
denoting nested loops, try statements, and such.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_EXCEPT">
<tt class="descname">POP_EXCEPT</tt><a class="headerlink" href="#opcode-POP_EXCEPT" title="Permalink to this definition">¶</a></dt>
<dd><p>Removes one block from the block stack. The popped block must be an exception
handler block, as implicitly created when entering an except handler.
In addition to popping extraneous values from the frame stack, the
last three popped values are used to restore the exception state.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-END_FINALLY">
<tt class="descname">END_FINALLY</tt><a class="headerlink" href="#opcode-END_FINALLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Terminates a <a class="reference internal" href="../reference/compound_stmts.html#finally"><tt class="xref std std-keyword docutils literal"><span class="pre">finally</span></tt></a> clause.  The interpreter recalls whether the
exception has to be re-raised, or whether the function returns, and continues
with the outer-next block.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_BUILD_CLASS">
<tt class="descname">LOAD_BUILD_CLASS</tt><a class="headerlink" href="#opcode-LOAD_BUILD_CLASS" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes <tt class="xref py py-func docutils literal"><span class="pre">builtins.__build_class__()</span></tt> onto the stack.  It is later called
by <tt class="docutils literal"><span class="pre">CALL_FUNCTION</span></tt> to construct a class.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_WITH">
<tt class="descname">SETUP_WITH</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-SETUP_WITH" title="Permalink to this definition">¶</a></dt>
<dd><p>This opcode performs several operations before a with block starts.  First,
it loads <a class="reference internal" href="../reference/datamodel.html#object.__exit__" title="object.__exit__"><tt class="xref py py-meth docutils literal"><span class="pre">__exit__()</span></tt></a> from the context manager and pushes it onto
the stack for later use by <a class="reference internal" href="#opcode-WITH_CLEANUP"><tt class="xref std std-opcode docutils literal"><span class="pre">WITH_CLEANUP</span></tt></a>.  Then,
<a class="reference internal" href="../reference/datamodel.html#object.__enter__" title="object.__enter__"><tt class="xref py py-meth docutils literal"><span class="pre">__enter__()</span></tt></a> is called, and a finally block pointing to <em>delta</em>
is pushed.  Finally, the result of calling the enter method is pushed onto
the stack.  The next opcode will either ignore it (<a class="reference internal" href="#opcode-POP_TOP"><tt class="xref std std-opcode docutils literal"><span class="pre">POP_TOP</span></tt></a>), or
store it in (a) variable(s) (<a class="reference internal" href="#opcode-STORE_FAST"><tt class="xref std std-opcode docutils literal"><span class="pre">STORE_FAST</span></tt></a>, <a class="reference internal" href="#opcode-STORE_NAME"><tt class="xref std std-opcode docutils literal"><span class="pre">STORE_NAME</span></tt></a>, or
<a class="reference internal" href="#opcode-UNPACK_SEQUENCE"><tt class="xref std std-opcode docutils literal"><span class="pre">UNPACK_SEQUENCE</span></tt></a>).</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-WITH_CLEANUP">
<tt class="descname">WITH_CLEANUP</tt><a class="headerlink" href="#opcode-WITH_CLEANUP" title="Permalink to this definition">¶</a></dt>
<dd><p>Cleans up the stack when a <a class="reference internal" href="../reference/compound_stmts.html#with"><tt class="xref std std-keyword docutils literal"><span class="pre">with</span></tt></a> statement block exits.  TOS is
the context manager&#8217;s <a class="reference internal" href="../reference/datamodel.html#object.__exit__" title="object.__exit__"><tt class="xref py py-meth docutils literal"><span class="pre">__exit__()</span></tt></a> bound method. Below TOS are 1&#8211;3
values indicating how/why the finally clause was entered:</p>
<ul class="simple">
<li>SECOND = <tt class="xref docutils literal"><span class="pre">None</span></tt></li>
<li>(SECOND, THIRD) = (<tt class="docutils literal"><span class="pre">WHY_{RETURN,CONTINUE}</span></tt>), retval</li>
<li>SECOND = <tt class="docutils literal"><span class="pre">WHY_*</span></tt>; no retval below it</li>
<li>(SECOND, THIRD, FOURTH) = exc_info()</li>
</ul>
<p>In the last case, <tt class="docutils literal"><span class="pre">TOS(SECOND,</span> <span class="pre">THIRD,</span> <span class="pre">FOURTH)</span></tt> is called, otherwise
<tt class="docutils literal"><span class="pre">TOS(None,</span> <span class="pre">None,</span> <span class="pre">None)</span></tt>.  In addition, TOS is removed from the stack.</p>
<p>If the stack represents an exception, <em>and</em> the function call returns
a &#8216;true&#8217; value, this information is &#8220;zapped&#8221; and replaced with a single
<tt class="docutils literal"><span class="pre">WHY_SILENCED</span></tt> to prevent <tt class="docutils literal"><span class="pre">END_FINALLY</span></tt> from re-raising the exception.
(But non-local gotos will still be resumed.)</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_LOCALS">
<tt class="descname">STORE_LOCALS</tt><a class="headerlink" href="#opcode-STORE_LOCALS" title="Permalink to this definition">¶</a></dt>
<dd><p>Pops TOS from the stack and stores it as the current frame&#8217;s <tt class="docutils literal"><span class="pre">f_locals</span></tt>.
This is used in class construction.</p>
</dd></dl>

<p>All of the following opcodes expect arguments.  An argument is two bytes, with
the more significant byte last.</p>
<dl class="opcode">
<dt id="opcode-STORE_NAME">
<tt class="descname">STORE_NAME</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-STORE_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">name</span> <span class="pre">=</span> <span class="pre">TOS</span></tt>. <em>namei</em> is the index of <em>name</em> in the attribute
<tt class="xref py py-attr docutils literal"><span class="pre">co_names</span></tt> of the code object. The compiler tries to use <tt class="docutils literal"><span class="pre">STORE_FAST</span></tt>
or <tt class="docutils literal"><span class="pre">STORE_GLOBAL</span></tt> if possible.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_NAME">
<tt class="descname">DELETE_NAME</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-DELETE_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">del</span> <span class="pre">name</span></tt>, where <em>namei</em> is the index into <tt class="xref py py-attr docutils literal"><span class="pre">co_names</span></tt>
attribute of the code object.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNPACK_SEQUENCE">
<tt class="descname">UNPACK_SEQUENCE</tt><big>(</big><em>count</em><big>)</big><a class="headerlink" href="#opcode-UNPACK_SEQUENCE" title="Permalink to this definition">¶</a></dt>
<dd><p>Unpacks TOS into <em>count</em> individual values, which are put onto the stack
right-to-left.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-UNPACK_EX">
<tt class="descname">UNPACK_EX</tt><big>(</big><em>counts</em><big>)</big><a class="headerlink" href="#opcode-UNPACK_EX" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements assignment with a starred target: Unpacks an iterable in TOS into
individual values, where the total number of values can be smaller than the
number of items in the iterable: one the new values will be a list of all
leftover items.</p>
<p>The low byte of <em>counts</em> is the number of values before the list value, the
high byte of <em>counts</em> the number of values after it.  The resulting values
are put onto the stack right-to-left.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_ATTR">
<tt class="descname">STORE_ATTR</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-STORE_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">TOS.name</span> <span class="pre">=</span> <span class="pre">TOS1</span></tt>, where <em>namei</em> is the index of name in
<tt class="xref py py-attr docutils literal"><span class="pre">co_names</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_ATTR">
<tt class="descname">DELETE_ATTR</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-DELETE_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Implements <tt class="docutils literal"><span class="pre">del</span> <span class="pre">TOS.name</span></tt>, using <em>namei</em> as index into <tt class="xref py py-attr docutils literal"><span class="pre">co_names</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_GLOBAL">
<tt class="descname">STORE_GLOBAL</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-STORE_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <tt class="docutils literal"><span class="pre">STORE_NAME</span></tt>, but stores the name as a global.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_GLOBAL">
<tt class="descname">DELETE_GLOBAL</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-DELETE_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <tt class="docutils literal"><span class="pre">DELETE_NAME</span></tt>, but deletes a global name.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_CONST">
<tt class="descname">LOAD_CONST</tt><big>(</big><em>consti</em><big>)</big><a class="headerlink" href="#opcode-LOAD_CONST" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes <tt class="docutils literal"><span class="pre">co_consts[consti]</span></tt> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_NAME">
<tt class="descname">LOAD_NAME</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-LOAD_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes the value associated with <tt class="docutils literal"><span class="pre">co_names[namei]</span></tt> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_TUPLE">
<tt class="descname">BUILD_TUPLE</tt><big>(</big><em>count</em><big>)</big><a class="headerlink" href="#opcode-BUILD_TUPLE" title="Permalink to this definition">¶</a></dt>
<dd><p>Creates a tuple consuming <em>count</em> items from the stack, and pushes the resulting
tuple onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_LIST">
<tt class="descname">BUILD_LIST</tt><big>(</big><em>count</em><big>)</big><a class="headerlink" href="#opcode-BUILD_LIST" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <tt class="docutils literal"><span class="pre">BUILD_TUPLE</span></tt>, but creates a list.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_SET">
<tt class="descname">BUILD_SET</tt><big>(</big><em>count</em><big>)</big><a class="headerlink" href="#opcode-BUILD_SET" title="Permalink to this definition">¶</a></dt>
<dd><p>Works as <tt class="docutils literal"><span class="pre">BUILD_TUPLE</span></tt>, but creates a set.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_MAP">
<tt class="descname">BUILD_MAP</tt><big>(</big><em>count</em><big>)</big><a class="headerlink" href="#opcode-BUILD_MAP" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a new dictionary object onto the stack.  The dictionary is pre-sized
to hold <em>count</em> entries.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_ATTR">
<tt class="descname">LOAD_ATTR</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-LOAD_ATTR" title="Permalink to this definition">¶</a></dt>
<dd><p>Replaces TOS with <tt class="docutils literal"><span class="pre">getattr(TOS,</span> <span class="pre">co_names[namei])</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-COMPARE_OP">
<tt class="descname">COMPARE_OP</tt><big>(</big><em>opname</em><big>)</big><a class="headerlink" href="#opcode-COMPARE_OP" title="Permalink to this definition">¶</a></dt>
<dd><p>Performs a Boolean operation.  The operation name can be found in
<tt class="docutils literal"><span class="pre">cmp_op[opname]</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_NAME">
<tt class="descname">IMPORT_NAME</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-IMPORT_NAME" title="Permalink to this definition">¶</a></dt>
<dd><p>Imports the module <tt class="docutils literal"><span class="pre">co_names[namei]</span></tt>.  TOS and TOS1 are popped and provide
the <em>fromlist</em> and <em>level</em> arguments of <a class="reference internal" href="functions.html#__import__" title="__import__"><tt class="xref py py-func docutils literal"><span class="pre">__import__()</span></tt></a>.  The module
object is pushed onto the stack.  The current namespace is not affected:
for a proper import statement, a subsequent <tt class="docutils literal"><span class="pre">STORE_FAST</span></tt> instruction
modifies the namespace.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-IMPORT_FROM">
<tt class="descname">IMPORT_FROM</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-IMPORT_FROM" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the attribute <tt class="docutils literal"><span class="pre">co_names[namei]</span></tt> from the module found in TOS. The
resulting object is pushed onto the stack, to be subsequently stored by a
<tt class="docutils literal"><span class="pre">STORE_FAST</span></tt> instruction.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_FORWARD">
<tt class="descname">JUMP_FORWARD</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-JUMP_FORWARD" title="Permalink to this definition">¶</a></dt>
<dd><p>Increments bytecode counter by <em>delta</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_JUMP_IF_TRUE">
<tt class="descname">POP_JUMP_IF_TRUE</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-POP_JUMP_IF_TRUE" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is true, sets the bytecode counter to <em>target</em>.  TOS is popped.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-POP_JUMP_IF_FALSE">
<tt class="descname">POP_JUMP_IF_FALSE</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-POP_JUMP_IF_FALSE" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is false, sets the bytecode counter to <em>target</em>.  TOS is popped.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_IF_TRUE_OR_POP">
<tt class="descname">JUMP_IF_TRUE_OR_POP</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-JUMP_IF_TRUE_OR_POP" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is true, sets the bytecode counter to <em>target</em> and leaves TOS
on the stack.  Otherwise (TOS is false), TOS is popped.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_IF_FALSE_OR_POP">
<tt class="descname">JUMP_IF_FALSE_OR_POP</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-JUMP_IF_FALSE_OR_POP" title="Permalink to this definition">¶</a></dt>
<dd><p>If TOS is false, sets the bytecode counter to <em>target</em> and leaves
TOS on the stack.  Otherwise (TOS is true), TOS is popped.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-JUMP_ABSOLUTE">
<tt class="descname">JUMP_ABSOLUTE</tt><big>(</big><em>target</em><big>)</big><a class="headerlink" href="#opcode-JUMP_ABSOLUTE" title="Permalink to this definition">¶</a></dt>
<dd><p>Set bytecode counter to <em>target</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-FOR_ITER">
<tt class="descname">FOR_ITER</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-FOR_ITER" title="Permalink to this definition">¶</a></dt>
<dd><p><tt class="docutils literal"><span class="pre">TOS</span></tt> is an <a class="reference internal" href="../glossary.html#term-iterator"><em class="xref std std-term">iterator</em></a>.  Call its <tt class="xref py py-meth docutils literal"><span class="pre">__next__()</span></tt> method.  If this
yields a new value, push it on the stack (leaving the iterator below it).  If
the iterator indicates it is exhausted <tt class="docutils literal"><span class="pre">TOS</span></tt> is popped, and the byte code
counter is incremented by <em>delta</em>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_GLOBAL">
<tt class="descname">LOAD_GLOBAL</tt><big>(</big><em>namei</em><big>)</big><a class="headerlink" href="#opcode-LOAD_GLOBAL" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the global named <tt class="docutils literal"><span class="pre">co_names[namei]</span></tt> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_LOOP">
<tt class="descname">SETUP_LOOP</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-SETUP_LOOP" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a block for a loop onto the block stack.  The block spans from the
current instruction with a size of <em>delta</em> bytes.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_EXCEPT">
<tt class="descname">SETUP_EXCEPT</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-SETUP_EXCEPT" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a try block from a try-except clause onto the block stack. <em>delta</em> points
to the first except block.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-SETUP_FINALLY">
<tt class="descname">SETUP_FINALLY</tt><big>(</big><em>delta</em><big>)</big><a class="headerlink" href="#opcode-SETUP_FINALLY" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a try block from a try-except clause onto the block stack. <em>delta</em> points
to the finally block.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_MAP">
<tt class="descname">STORE_MAP</tt><a class="headerlink" href="#opcode-STORE_MAP" title="Permalink to this definition">¶</a></dt>
<dd><p>Store a key and value pair in a dictionary.  Pops the key and value while leaving
the dictionary on the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_FAST">
<tt class="descname">LOAD_FAST</tt><big>(</big><em>var_num</em><big>)</big><a class="headerlink" href="#opcode-LOAD_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a reference to the local <tt class="docutils literal"><span class="pre">co_varnames[var_num]</span></tt> onto the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_FAST">
<tt class="descname">STORE_FAST</tt><big>(</big><em>var_num</em><big>)</big><a class="headerlink" href="#opcode-STORE_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Stores TOS into the local <tt class="docutils literal"><span class="pre">co_varnames[var_num]</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_FAST">
<tt class="descname">DELETE_FAST</tt><big>(</big><em>var_num</em><big>)</big><a class="headerlink" href="#opcode-DELETE_FAST" title="Permalink to this definition">¶</a></dt>
<dd><p>Deletes local <tt class="docutils literal"><span class="pre">co_varnames[var_num]</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_CLOSURE">
<tt class="descname">LOAD_CLOSURE</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-LOAD_CLOSURE" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a reference to the cell contained in slot <em>i</em> of the cell and free
variable storage.  The name of the variable is  <tt class="docutils literal"><span class="pre">co_cellvars[i]</span></tt> if <em>i</em> is
less than the length of <em>co_cellvars</em>.  Otherwise it is  <tt class="docutils literal"><span class="pre">co_freevars[i</span> <span class="pre">-</span>
<span class="pre">len(co_cellvars)]</span></tt>.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-LOAD_DEREF">
<tt class="descname">LOAD_DEREF</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-LOAD_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Loads the cell contained in slot <em>i</em> of the cell and free variable storage.
Pushes a reference to the object the cell contains on the stack.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-STORE_DEREF">
<tt class="descname">STORE_DEREF</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-STORE_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Stores TOS into the cell contained in slot <em>i</em> of the cell and free variable
storage.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-DELETE_DEREF">
<tt class="descname">DELETE_DEREF</tt><big>(</big><em>i</em><big>)</big><a class="headerlink" href="#opcode-DELETE_DEREF" title="Permalink to this definition">¶</a></dt>
<dd><p>Empties the cell contained in slot <em>i</em> of the cell and free variable storage.
Used by the <a class="reference internal" href="../reference/simple_stmts.html#del"><tt class="xref std std-keyword docutils literal"><span class="pre">del</span></tt></a> statement.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-RAISE_VARARGS">
<tt class="descname">RAISE_VARARGS</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-RAISE_VARARGS" title="Permalink to this definition">¶</a></dt>
<dd><p>Raises an exception. <em>argc</em> indicates the number of parameters to the raise
statement, ranging from 0 to 3.  The handler will find the traceback as TOS2,
the parameter as TOS1, and the exception as TOS.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION">
<tt class="descname">CALL_FUNCTION</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-CALL_FUNCTION" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a function.  The low byte of <em>argc</em> indicates the number of positional
parameters, the high byte the number of keyword parameters. On the stack, the
opcode finds the keyword parameters first.  For each keyword argument, the value
is on top of the key.  Below the keyword parameters, the positional parameters
are on the stack, with the right-most parameter on top.  Below the parameters,
the function object to call is on the stack.  Pops all function arguments, and
the function itself off the stack, and pushes the return value.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-MAKE_FUNCTION">
<tt class="descname">MAKE_FUNCTION</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-MAKE_FUNCTION" title="Permalink to this definition">¶</a></dt>
<dd><p>Pushes a new function object on the stack.  TOS is the code associated with the
function.  The function object is defined to have <em>argc</em> default parameters,
which are found below TOS.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-MAKE_CLOSURE">
<tt class="descname">MAKE_CLOSURE</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-MAKE_CLOSURE" title="Permalink to this definition">¶</a></dt>
<dd><p>Creates a new function object, sets its <em>__closure__</em> slot, and pushes it on
the stack.  TOS is the code associated with the function, TOS1 the tuple
containing cells for the closure&#8217;s free variables.  The function also has
<em>argc</em> default parameters, which are found below the cells.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-BUILD_SLICE">
<tt class="descname">BUILD_SLICE</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-BUILD_SLICE" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-0">Pushes a slice object on the stack.  <em>argc</em> must be 2 or 3.  If it is 2,
<tt class="docutils literal"><span class="pre">slice(TOS1,</span> <span class="pre">TOS)</span></tt> is pushed; if it is 3, <tt class="docutils literal"><span class="pre">slice(TOS2,</span> <span class="pre">TOS1,</span> <span class="pre">TOS)</span></tt> is
pushed. See the <a class="reference internal" href="functions.html#slice" title="slice"><tt class="xref py py-func docutils literal"><span class="pre">slice()</span></tt></a> built-in function for more information.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-EXTENDED_ARG">
<tt class="descname">EXTENDED_ARG</tt><big>(</big><em>ext</em><big>)</big><a class="headerlink" href="#opcode-EXTENDED_ARG" title="Permalink to this definition">¶</a></dt>
<dd><p>Prefixes any opcode which has an argument too big to fit into the default two
bytes.  <em>ext</em> holds two additional bytes which, taken together with the
subsequent opcode&#8217;s argument, comprise a four-byte argument, <em>ext</em> being the two
most-significant bytes.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION_VAR">
<tt class="descname">CALL_FUNCTION_VAR</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-CALL_FUNCTION_VAR" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a function. <em>argc</em> is interpreted as in <tt class="docutils literal"><span class="pre">CALL_FUNCTION</span></tt>. The top element
on the stack contains the variable argument list, followed by keyword and
positional arguments.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION_KW">
<tt class="descname">CALL_FUNCTION_KW</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-CALL_FUNCTION_KW" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a function. <em>argc</em> is interpreted as in <tt class="docutils literal"><span class="pre">CALL_FUNCTION</span></tt>. The top element
on the stack contains the keyword arguments dictionary,  followed by explicit
keyword and positional arguments.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-CALL_FUNCTION_VAR_KW">
<tt class="descname">CALL_FUNCTION_VAR_KW</tt><big>(</big><em>argc</em><big>)</big><a class="headerlink" href="#opcode-CALL_FUNCTION_VAR_KW" title="Permalink to this definition">¶</a></dt>
<dd><p>Calls a function. <em>argc</em> is interpreted as in <tt class="docutils literal"><span class="pre">CALL_FUNCTION</span></tt>.  The top
element on the stack contains the keyword arguments dictionary, followed by the
variable-arguments tuple, followed by explicit keyword and positional arguments.</p>
</dd></dl>

<dl class="opcode">
<dt id="opcode-HAVE_ARGUMENT">
<tt class="descname">HAVE_ARGUMENT</tt><a class="headerlink" href="#opcode-HAVE_ARGUMENT" title="Permalink to this definition">¶</a></dt>
<dd><p>This is not really an opcode.  It identifies the dividing line between opcodes
which don&#8217;t take arguments <tt class="docutils literal"><span class="pre">&lt;</span> <span class="pre">HAVE_ARGUMENT</span></tt> and those which do <tt class="docutils literal"><span class="pre">&gt;=</span>
<span class="pre">HAVE_ARGUMENT</span></tt>.</p>
</dd></dl>

</div>
</div>


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<li><a class="reference internal" href="#">30.12. <tt class="docutils literal"><span class="pre">dis</span></tt> &#8212; Disassembler for Python bytecode</a><ul>
<li><a class="reference internal" href="#python-bytecode-instructions">30.12.1. Python Bytecode Instructions</a></li>
</ul>
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