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107 lines
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<title>Python Commands - Debugging with GDB</title>
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<a name="Python-Commands"></a>
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Next: <a rel="next" accesskey="n" href="Python-API.html#Python-API">Python API</a>,
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Up: <a rel="up" accesskey="u" href="Python.html#Python">Python</a>
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<h4 class="subsection">23.2.1 Python Commands</h4>
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<p><a name="index-python-commands-1839"></a><a name="index-commands-to-access-python-1840"></a>
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<span class="sc">gdb</span> provides two commands for accessing the Python interpreter,
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and one related setting:
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<a name="index-python_002dinteractive-1841"></a>
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<a name="index-pi-1842"></a>
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<dl><dt><code>python-interactive </code><span class="roman">[</span><var>command</var><span class="roman">]</span><dt><code>pi </code><span class="roman">[</span><var>command</var><span class="roman">]</span><dd>Without an argument, the <code>python-interactive</code> command can be used
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to start an interactive Python prompt. To return to <span class="sc">gdb</span>,
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type the <code>EOF</code> character (e.g., <kbd>Ctrl-D</kbd> on an empty prompt).
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<p>Alternatively, a single-line Python command can be given as an
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argument and evaluated. If the command is an expression, the result
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will be printed; otherwise, nothing will be printed. For example:
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<pre class="smallexample"> (gdb) python-interactive 2 + 3
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5
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</pre>
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<p><a name="index-python-1843"></a><a name="index-py-1844"></a><br><dt><code>python </code><span class="roman">[</span><var>command</var><span class="roman">]</span><dt><code>py </code><span class="roman">[</span><var>command</var><span class="roman">]</span><dd>The <code>python</code> command can be used to evaluate Python code.
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<p>If given an argument, the <code>python</code> command will evaluate the
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argument as a Python command. For example:
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<pre class="smallexample"> (gdb) python print 23
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23
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</pre>
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<p>If you do not provide an argument to <code>python</code>, it will act as a
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multi-line command, like <code>define</code>. In this case, the Python
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script is made up of subsequent command lines, given after the
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<code>python</code> command. This command list is terminated using a line
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containing <code>end</code>. For example:
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<pre class="smallexample"> (gdb) python
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Type python script
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End with a line saying just "end".
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>print 23
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>end
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23
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</pre>
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<p><a name="index-set-python-print_002dstack-1845"></a><br><dt><code>set python print-stack</code><dd>By default, <span class="sc">gdb</span> will print only the message component of a
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Python exception when an error occurs in a Python script. This can be
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controlled using <code>set python print-stack</code>: if <code>full</code>, then
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full Python stack printing is enabled; if <code>none</code>, then Python stack
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and message printing is disabled; if <code>message</code>, the default, only
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the message component of the error is printed.
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</dl>
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<p>It is also possible to execute a Python script from the <span class="sc">gdb</span>
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interpreter:
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<dl>
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<dt><code>source </code><samp><span class="file">script-name</span></samp><dd>The script name must end with ‘<samp><span class="samp">.py</span></samp>’ and <span class="sc">gdb</span> must be configured
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to recognize the script language based on filename extension using
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the <code>script-extension</code> setting. See <a href="Extending-GDB.html#Extending-GDB">Extending GDB</a>.
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</dl>
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</body></html>
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