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159 lines
6.5 KiB
HTML
159 lines
6.5 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Python Commands (Debugging with GDB)</title>
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<meta name="description" content="Python Commands (Debugging with GDB)">
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<meta name="keywords" content="Python Commands (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Python.html#Python" rel="up" title="Python">
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<link href="Python-API.html#Python-API" rel="next" title="Python API">
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<link href="Python.html#Python" rel="prev" title="Python">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Python-Commands"></a>
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<div class="header">
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<p>
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Next: <a href="Python-API.html#Python-API" accesskey="n" rel="next">Python API</a>, Up: <a href="Python.html#Python" accesskey="u" rel="up">Python</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Python-Commands-1"></a>
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<h4 class="subsection">23.2.1 Python Commands</h4>
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<a name="index-python-commands"></a>
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<a name="index-commands-to-access-python"></a>
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<p><small>GDB</small> provides two commands for accessing the Python interpreter,
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and one related setting:
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</p>
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<dl compact="compact">
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<dd><a name="index-python_002dinteractive"></a>
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<a name="index-pi"></a>
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</dd>
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<dt><code>python-interactive <span class="roman">[</span><var>command</var><span class="roman">]</span></code></dt>
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<dt><code>pi <span class="roman">[</span><var>command</var><span class="roman">]</span></code></dt>
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<dd><p>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 <small>GDB</small>,
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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>
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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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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) python-interactive 2 + 3
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5
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</pre></div>
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<a name="index-python-1"></a>
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<a name="index-py"></a>
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</dd>
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<dt><code>python <span class="roman">[</span><var>command</var><span class="roman">]</span></code></dt>
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<dt><code>py <span class="roman">[</span><var>command</var><span class="roman">]</span></code></dt>
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<dd><p>The <code>python</code> command can be used to evaluate Python code.
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</p>
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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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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) python print 23
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23
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</pre></div>
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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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</p>
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<div class="smallexample">
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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></div>
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<a name="index-set-python-print_002dstack"></a>
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</dd>
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<dt><code>set python print-stack</code></dt>
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<dd><p>By default, <small>GDB</small> 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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</p></dd>
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</dl>
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<p>It is also possible to execute a Python script from the <small>GDB</small>
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interpreter:
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</p>
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<dl compact="compact">
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<dt><code>source <samp>script-name</samp></code></dt>
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<dd><p>The script name must end with ‘<samp>.py</samp>’ and <small>GDB</small> 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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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Python-API.html#Python-API" accesskey="n" rel="next">Python API</a>, Up: <a href="Python.html#Python" accesskey="u" rel="up">Python</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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