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<div class="section" id="module-rlcompleter">
<span id="rlcompleter-completion-function-for-gnu-readline"></span><h1>16.7. <a class="reference internal" href="#module-rlcompleter" title="rlcompleter: Python identifier completion, suitable for the GNU readline library."><tt class="xref py py-mod docutils literal"><span class="pre">rlcompleter</span></tt></a> — Completion function for GNU readline<a class="headerlink" href="#module-rlcompleter" 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/rlcompleter.py">Lib/rlcompleter.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-rlcompleter" title="rlcompleter: Python identifier completion, suitable for the GNU readline library."><tt class="xref py py-mod docutils literal"><span class="pre">rlcompleter</span></tt></a> module defines a completion function suitable for the
<a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><tt class="xref py py-mod docutils literal"><span class="pre">readline</span></tt></a> module by completing valid Python identifiers and keywords.</p>
<p>When this module is imported on a Unix platform with the <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><tt class="xref py py-mod docutils literal"><span class="pre">readline</span></tt></a> module
available, an instance of the <tt class="xref py py-class docutils literal"><span class="pre">Completer</span></tt> class is automatically created
and its <tt class="xref py py-meth docutils literal"><span class="pre">complete()</span></tt> method is set as the <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><tt class="xref py py-mod docutils literal"><span class="pre">readline</span></tt></a> completer.</p>
<p>Example:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">rlcompleter</span>
<span class="gp">>>> </span><span class="kn">import</span> <span class="nn">readline</span>
<span class="gp">>>> </span><span class="n">readline</span><span class="o">.</span><span class="n">parse_and_bind</span><span class="p">(</span><span class="s">"tab: complete"</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">readline</span><span class="o">.</span> <span class="o"><</span><span class="n">TAB</span> <span class="n">PRESSED</span><span class="o">></span>
<span class="go">readline.__doc__ readline.get_line_buffer( readline.read_init_file(</span>
<span class="go">readline.__file__ readline.insert_text( readline.set_completer(</span>
<span class="go">readline.__name__ readline.parse_and_bind(</span>
<span class="gp">>>> </span><span class="n">readline</span><span class="o">.</span>
</pre></div>
</div>
<p>The <a class="reference internal" href="#module-rlcompleter" title="rlcompleter: Python identifier completion, suitable for the GNU readline library."><tt class="xref py py-mod docutils literal"><span class="pre">rlcompleter</span></tt></a> module is designed for use with Python’s interactive
mode. A user can add the following lines to his or her initialization file
(identified by the <span class="target" id="index-0"></span><a class="reference internal" href="../using/cmdline.html#envvar-PYTHONSTARTUP"><tt class="xref std std-envvar docutils literal"><span class="pre">PYTHONSTARTUP</span></tt></a> environment variable) to get
automatic <tt class="kbd docutils literal"><span class="pre">Tab</span></tt> completion:</p>
<div class="highlight-python3"><div class="highlight"><pre><span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">readline</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s">"Module readline not available."</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">rlcompleter</span>
<span class="n">readline</span><span class="o">.</span><span class="n">parse_and_bind</span><span class="p">(</span><span class="s">"tab: complete"</span><span class="p">)</span>
</pre></div>
</div>
<p>On platforms without <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><tt class="xref py py-mod docutils literal"><span class="pre">readline</span></tt></a>, the <tt class="xref py py-class docutils literal"><span class="pre">Completer</span></tt> class defined by
this module can still be used for custom purposes.</p>
<div class="section" id="completer-objects">
<span id="id1"></span><h2>16.7.1. Completer Objects<a class="headerlink" href="#completer-objects" title="Permalink to this headline">¶</a></h2>
<p>Completer objects have the following method:</p>
<dl class="method">
<dt id="rlcompleter.Completer.complete">
<tt class="descclassname">Completer.</tt><tt class="descname">complete</tt><big>(</big><em>text</em>, <em>state</em><big>)</big><a class="headerlink" href="#rlcompleter.Completer.complete" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the <em>state</em>th completion for <em>text</em>.</p>
<p>If called for <em>text</em> that doesn’t include a period character (<tt class="docutils literal"><span class="pre">'.'</span></tt>), it will
complete from names currently defined in <a class="reference internal" href="__main__.html#module-__main__" title="__main__: The environment where the top-level script is run."><tt class="xref py py-mod docutils literal"><span class="pre">__main__</span></tt></a>, <a class="reference internal" href="builtins.html#module-builtins" title="builtins: The module that provides the built-in namespace."><tt class="xref py py-mod docutils literal"><span class="pre">builtins</span></tt></a> and
keywords (as defined by the <a class="reference internal" href="keyword.html#module-keyword" title="keyword: Test whether a string is a keyword in Python."><tt class="xref py py-mod docutils literal"><span class="pre">keyword</span></tt></a> module).</p>
<p>If called for a dotted name, it will try to evaluate anything without obvious
side-effects (functions will not be evaluated, but it can generate calls to
<a class="reference internal" href="../reference/datamodel.html#object.__getattr__" title="object.__getattr__"><tt class="xref py py-meth docutils literal"><span class="pre">__getattr__()</span></tt></a>) up to the last part, and find matches for the rest via the
<a class="reference internal" href="functions.html#dir" title="dir"><tt class="xref py py-func docutils literal"><span class="pre">dir()</span></tt></a> function. Any exception raised during the evaluation of the
expression is caught, silenced and <a class="reference internal" href="constants.html#None" title="None"><tt class="xref py py-const xref docutils literal"><span class="pre">None</span></tt></a> is returned.</p>
</dd></dl>
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<h3><a href="../contents.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">16.7. <tt class="docutils literal"><span class="pre">rlcompleter</span></tt> — Completion function for GNU readline</a><ul>
<li><a class="reference internal" href="#completer-objects">16.7.1. Completer Objects</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="readline.html"
title="previous chapter">16.6. <tt class="docutils literal docutils literal docutils literal"><span class="pre">readline</span></tt> — GNU readline interface</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="dummy_threading.html"
title="next chapter">16.8. <tt class="docutils literal docutils literal docutils literal"><span class="pre">dummy_threading</span></tt> — Drop-in replacement for the <tt class="docutils literal docutils literal docutils literal"><span class="pre">threading</span></tt> module</a></p>
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