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<section id="module-rlcompleter">
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<span id="rlcompleter-completion-function-for-gnu-readline"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">rlcompleter</span></code> — Completion function for GNU readline<a class="headerlink" href="#module-rlcompleter" title="Link to this heading">¶</a></h1>
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<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/rlcompleter.py">Lib/rlcompleter.py</a></p>
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<hr class="docutils" />
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<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">rlcompleter</span></code> module defines a completion function suitable to be
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passed to <a class="reference internal" href="readline.html#readline.set_completer" title="readline.set_completer"><code class="xref py py-func docutils literal notranslate"><span class="pre">set_completer()</span></code></a> in the <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">readline</span></code></a> module.</p>
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<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)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">readline</span></code></a> module
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available, an instance of the <a class="reference internal" href="#rlcompleter.Completer" title="rlcompleter.Completer"><code class="xref py py-class docutils literal notranslate"><span class="pre">Completer</span></code></a> class is automatically created
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and its <a class="reference internal" href="#rlcompleter.Completer.complete" title="rlcompleter.Completer.complete"><code class="xref py py-meth docutils literal notranslate"><span class="pre">complete()</span></code></a> method is set as the
|
||
<a class="reference internal" href="readline.html#readline-completion"><span class="std std-ref">readline completer</span></a>. The method provides
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||
completion of valid Python <a class="reference internal" href="../reference/lexical_analysis.html#identifiers"><span class="std std-ref">identifiers and keywords</span></a>.</p>
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||
<p>Example:</p>
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||
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">rlcompleter</span>
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<span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">readline</span>
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<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="s2">"tab: complete"</span><span class="p">)</span>
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<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>
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<span class="go">readline.__doc__ readline.get_line_buffer( readline.read_init_file(</span>
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<span class="go">readline.__file__ readline.insert_text( readline.set_completer(</span>
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<span class="go">readline.__name__ readline.parse_and_bind(</span>
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<span class="gp">>>> </span><span class="n">readline</span><span class="o">.</span>
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</pre></div>
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</div>
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<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">rlcompleter</span></code> module is designed for use with Python’s
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<a class="reference internal" href="../tutorial/interpreter.html#tut-interactive"><span class="std std-ref">interactive mode</span></a>. Unless Python is run with the
|
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<a class="reference internal" href="../using/cmdline.html#cmdoption-S"><code class="xref std std-option docutils literal notranslate"><span class="pre">-S</span></code></a> option, the module is automatically imported and configured
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(see <a class="reference internal" href="site.html#rlcompleter-config"><span class="std std-ref">Readline configuration</span></a>).</p>
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<p>On platforms without <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">readline</span></code></a>, the <a class="reference internal" href="#rlcompleter.Completer" title="rlcompleter.Completer"><code class="xref py py-class docutils literal notranslate"><span class="pre">Completer</span></code></a> class defined by
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this module can still be used for custom purposes.</p>
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<dl class="py class" id="completer-objects">
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<dt class="sig sig-object py" id="rlcompleter.Completer">
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<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">rlcompleter.</span></span><span class="sig-name descname"><span class="pre">Completer</span></span><a class="headerlink" href="#rlcompleter.Completer" title="Link to this definition">¶</a></dt>
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<dd><p>Completer objects have the following method:</p>
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<dl class="py method">
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<dt class="sig sig-object py" id="rlcompleter.Completer.complete">
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<span class="sig-name descname"><span class="pre">complete</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">text</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">state</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#rlcompleter.Completer.complete" title="Link to this definition">¶</a></dt>
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<dd><p>Return the next possible completion for <em>text</em>.</p>
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<p>When called by the <a class="reference internal" href="readline.html#module-readline" title="readline: GNU readline support for Python. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">readline</span></code></a> module, this method is called
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successively with <code class="docutils literal notranslate"><span class="pre">state</span> <span class="pre">==</span> <span class="pre">0,</span> <span class="pre">1,</span> <span class="pre">2,</span> <span class="pre">...</span></code> until the method returns
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<code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
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<p>If called for <em>text</em> that doesn’t include a period character (<code class="docutils literal notranslate"><span class="pre">'.'</span></code>), it will
|
||
complete from names currently defined in <a class="reference internal" href="__main__.html#module-__main__" title="__main__: The environment where top-level code is run. Covers command-line interfaces, import-time behavior, and ``__name__ == '__main__'``."><code class="xref py py-mod docutils literal notranslate"><span class="pre">__main__</span></code></a>, <a class="reference internal" href="builtins.html#module-builtins" title="builtins: The module that provides the built-in namespace."><code class="xref py py-mod docutils literal notranslate"><span class="pre">builtins</span></code></a> and
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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."><code class="xref py py-mod docutils literal notranslate"><span class="pre">keyword</span></code></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
|
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<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>) up to the last part, and find matches for the
|
||
rest via the <a class="reference internal" href="functions.html#dir" title="dir"><code class="xref py py-func docutils literal notranslate"><span class="pre">dir()</span></code></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"><code class="xref py py-const docutils literal notranslate"><span class="pre">None</span></code></a> is
|
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returned.</p>
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|
||
<select class="theme-selector" oninput="activateTheme(this.value)">
|
||
<option value="auto" selected>Auto</option>
|
||
<option value="light">Light</option>
|
||
<option value="dark">Dark</option>
|
||
</select>
|
||
</label> |</li>
|
||
|
||
</ul>
|
||
</div>
|
||
<div class="footer">
|
||
©
|
||
<a href="../copyright.html">
|
||
|
||
Copyright
|
||
|
||
</a>
|
||
2001-2025, Python Software Foundation.
|
||
<br />
|
||
This page is licensed under the Python Software Foundation License Version 2.
|
||
<br />
|
||
Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.
|
||
<br />
|
||
|
||
See <a href="/license.html">History and License</a> for more information.<br />
|
||
|
||
|
||
<br />
|
||
|
||
The Python Software Foundation is a non-profit corporation.
|
||
<a href="https://www.python.org/psf/donations/">Please donate.</a>
|
||
<br />
|
||
<br />
|
||
Last updated on Apr 08, 2025 (14:33 UTC).
|
||
|
||
<a href="/bugs.html">Found a bug</a>?
|
||
|
||
<br />
|
||
|
||
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 8.2.3.
|
||
</div>
|
||
|
||
</body>
|
||
</html> |