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margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li class="switchers"> <div class="language_switcher_placeholder"></div> <div class="version_switcher_placeholder"></div> </li> <li> </li> <li id="cpython-language-and-version"> <a href="../index.html">3.10.12 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="language.html" accesskey="U">Python Language Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code> — Tools for pickle developers</a></li> <li class="right"> <div class="inline-search" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="module-pickletools"> <span id="pickletools-tools-for-pickle-developers"></span><h1><a class="reference internal" href="#module-pickletools" title="pickletools: Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code></a> — Tools for pickle developers<a class="headerlink" href="#module-pickletools" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.10/Lib/pickletools.py">Lib/pickletools.py</a></p> <hr class="docutils" /> <p>This module contains various constants relating to the intimate details of the <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> module, some lengthy comments about the implementation, and a few useful functions for analyzing pickled data. The contents of this module are useful for Python core developers who are working on the <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a>; ordinary users of the <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> module probably won’t find the <a class="reference internal" href="#module-pickletools" title="pickletools: Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code></a> module relevant.</p> <section id="command-line-usage"> <h2>Command line usage<a class="headerlink" href="#command-line-usage" title="Permalink to this headline">¶</a></h2> <div class="versionadded"> <p><span class="versionmodified added">New in version 3.2.</span></p> </div> <p>When invoked from the command line, <code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">-m</span> <span class="pre">pickletools</span></code> will disassemble the contents of one or more pickle files. Note that if you want to see the Python object stored in the pickle rather than the details of pickle format, you may want to use <code class="docutils literal notranslate"><span class="pre">-m</span> <span class="pre">pickle</span></code> instead. However, when the pickle file that you want to examine comes from an untrusted source, <code class="docutils literal notranslate"><span class="pre">-m</span> <span class="pre">pickletools</span></code> is a safer option because it does not execute pickle bytecode.</p> <p>For example, with a tuple <code class="docutils literal notranslate"><span class="pre">(1,</span> <span class="pre">2)</span></code> pickled in file <code class="docutils literal notranslate"><span class="pre">x.pickle</span></code>:</p> <div class="highlight-shell-session notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>python -m pickle x.pickle <span class="gp gp-VirtualEnv">(1, 2)</span> <span class="gp">$ </span>python -m pickletools x.pickle <span class="go"> 0: \x80 PROTO 3</span> <span class="go"> 2: K BININT1 1</span> <span class="go"> 4: K BININT1 2</span> <span class="go"> 6: \x86 TUPLE2</span> <span class="go"> 7: q BINPUT 0</span> <span class="go"> 9: . STOP</span> <span class="go">highest protocol among opcodes = 2</span> </pre></div> </div> <section id="command-line-options"> <h3>Command line options<a class="headerlink" href="#command-line-options" title="Permalink to this headline">¶</a></h3> <dl class="std cmdoption"> <dt class="sig sig-object std" id="cmdoption-pickletools-a"> <span id="cmdoption-pickletools-annotate"></span><span class="sig-name descname"><span class="pre">-a</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--annotate</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-pickletools-a" title="Permalink to this definition">¶</a></dt> <dd><p>Annotate each line with a short opcode description.</p> </dd></dl> <dl class="std cmdoption"> <dt class="sig sig-object std" id="cmdoption-pickletools-o"> <span id="cmdoption-pickletools-output"></span><span class="sig-name descname"><span class="pre">-o</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--output</span></span><span class="sig-prename descclassname"><span class="pre">=<file></span></span><a class="headerlink" href="#cmdoption-pickletools-o" title="Permalink to this definition">¶</a></dt> <dd><p>Name of a file where the output should be written.</p> </dd></dl> <dl class="std cmdoption"> <dt class="sig sig-object std" id="cmdoption-pickletools-l"> <span id="cmdoption-pickletools-indentlevel"></span><span class="sig-name descname"><span class="pre">-l</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--indentlevel</span></span><span class="sig-prename descclassname"><span class="pre">=<num></span></span><a class="headerlink" href="#cmdoption-pickletools-l" title="Permalink to this definition">¶</a></dt> <dd><p>The number of blanks by which to indent a new MARK level.</p> </dd></dl> <dl class="std cmdoption"> <dt class="sig sig-object std" id="cmdoption-pickletools-m"> <span id="cmdoption-pickletools-memo"></span><span class="sig-name descname"><span class="pre">-m</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--memo</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-pickletools-m" title="Permalink to this definition">¶</a></dt> <dd><p>When multiple objects are disassembled, preserve memo between disassemblies.</p> </dd></dl> <dl class="std cmdoption"> <dt class="sig sig-object std" id="cmdoption-pickletools-p"> <span id="cmdoption-pickletools-preamble"></span><span class="sig-name descname"><span class="pre">-p</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--preamble</span></span><span class="sig-prename descclassname"><span class="pre">=<preamble></span></span><a class="headerlink" href="#cmdoption-pickletools-p" title="Permalink to this definition">¶</a></dt> <dd><p>When more than one pickle file are specified, print given preamble before each disassembly.</p> </dd></dl> </section> </section> <section id="programmatic-interface"> <h2>Programmatic Interface<a class="headerlink" href="#programmatic-interface" title="Permalink to this headline">¶</a></h2> <dl class="py function"> <dt class="sig sig-object py" id="pickletools.dis"> <span class="sig-prename descclassname"><span class="pre">pickletools.</span></span><span class="sig-name descname"><span class="pre">dis</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pickle</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">out</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">memo</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">indentlevel</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">4</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">annotate</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">0</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pickletools.dis" title="Permalink to this definition">¶</a></dt> <dd><p>Outputs a symbolic disassembly of the pickle to the file-like object <em>out</em>, defaulting to <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code>. <em>pickle</em> can be a string or a file-like object. <em>memo</em> can be a Python dictionary that will be used as the pickle’s memo; it can be used to perform disassemblies across multiple pickles created by the same pickler. Successive levels, indicated by <code class="docutils literal notranslate"><span class="pre">MARK</span></code> opcodes in the stream, are indented by <em>indentlevel</em> spaces. If a nonzero value is given to <em>annotate</em>, each opcode in the output is annotated with a short description. The value of <em>annotate</em> is used as a hint for the column where annotation should start.</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 3.2: </span>The <em>annotate</em> argument.</p> </div> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pickletools.genops"> <span class="sig-prename descclassname"><span class="pre">pickletools.</span></span><span class="sig-name descname"><span class="pre">genops</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pickle</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pickletools.genops" title="Permalink to this definition">¶</a></dt> <dd><p>Provides an <a class="reference internal" href="../glossary.html#term-iterator"><span class="xref std std-term">iterator</span></a> over all of the opcodes in a pickle, returning a sequence of <code class="docutils literal notranslate"><span class="pre">(opcode,</span> <span class="pre">arg,</span> <span class="pre">pos)</span></code> triples. <em>opcode</em> is an instance of an <code class="xref py py-class docutils literal notranslate"><span class="pre">OpcodeInfo</span></code> class; <em>arg</em> is the decoded value, as a Python object, of the opcode’s argument; <em>pos</em> is the position at which this opcode is located. <em>pickle</em> can be a string or a file-like object.</p> </dd></dl> <dl class="py function"> <dt class="sig sig-object py" id="pickletools.optimize"> <span class="sig-prename descclassname"><span class="pre">pickletools.</span></span><span class="sig-name descname"><span class="pre">optimize</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">picklestring</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#pickletools.optimize" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a new equivalent pickle string after eliminating unused <code class="docutils literal notranslate"><span class="pre">PUT</span></code> opcodes. The optimized pickle is shorter, takes less transmission time, requires less storage space, and unpickles more efficiently.</p> </dd></dl> </section> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table of Contents</a></h3> <ul> <li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code> — Tools for pickle developers</a><ul> <li><a class="reference internal" href="#command-line-usage">Command line usage</a><ul> <li><a class="reference internal" href="#command-line-options">Command line options</a></li> </ul> </li> <li><a class="reference internal" href="#programmatic-interface">Programmatic Interface</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="dis.html" title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">dis</span></code> — Disassembler for Python bytecode</a></p> <h4>Next topic</h4> <p class="topless"><a href="windows.html" title="next chapter">MS Windows Specific Services</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.10/Doc/library/pickletools.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="windows.html" title="MS Windows Specific Services" >next</a> |</li> <li class="right" > <a href="dis.html" title="dis — Disassembler for Python bytecode" >previous</a> |</li> <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li class="switchers"> <div class="language_switcher_placeholder"></div> <div class="version_switcher_placeholder"></div> </li> <li> </li> <li id="cpython-language-and-version"> <a href="../index.html">3.10.12 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="language.html" >Python Language Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickletools</span></code> — Tools for pickle developers</a></li> <li class="right"> <div class="inline-search" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> | </li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 2001-2026, 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 January 26, 2026. <a href="/bugs.html">Found a bug</a>? <br /> Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.3.2. </div> </body> </html>
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