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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>8. Extending Distutils — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="Distributing Python Modules" href="index.html" /> <link rel="next" title="9. Command Reference" href="commandref.html" /> <link rel="prev" title="7. Examples" href="examples.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="commandref.html" title="9. Command Reference" accesskey="N">next</a> |</li> <li class="right" > <a href="examples.html" title="7. Examples" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" accesskey="U">Distributing Python Modules</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="extending-distutils"> <span id="id1"></span><h1>8. Extending Distutils<a class="headerlink" href="#extending-distutils" title="Permalink to this headline">¶</a></h1> <p>Distutils can be extended in various ways. Most extensions take the form of new commands or replacements for existing commands. New commands may be written to support new types of platform-specific packaging, for example, while replacements for existing commands may be made to modify details of how the command operates on a package.</p> <p>Most extensions of the distutils are made within <tt class="file docutils literal"><span class="pre">setup.py</span></tt> scripts that want to modify existing commands; many simply add a few file extensions that should be copied into packages in addition to <tt class="file docutils literal"><span class="pre">.py</span></tt> files as a convenience.</p> <p>Most distutils command implementations are subclasses of the <a class="reference internal" href="apiref.html#distutils.cmd.Command" title="distutils.cmd.Command"><tt class="xref py py-class docutils literal"><span class="pre">distutils.cmd.Command</span></tt></a> class. New commands may directly inherit from <tt class="xref py py-class docutils literal"><span class="pre">Command</span></tt>, while replacements often derive from <tt class="xref py py-class docutils literal"><span class="pre">Command</span></tt> indirectly, directly subclassing the command they are replacing. Commands are required to derive from <tt class="xref py py-class docutils literal"><span class="pre">Command</span></tt>.</p> <div class="section" id="integrating-new-commands"> <h2>8.1. Integrating new commands<a class="headerlink" href="#integrating-new-commands" title="Permalink to this headline">¶</a></h2> <p>There are different ways to integrate new command implementations into distutils. The most difficult is to lobby for the inclusion of the new features in distutils itself, and wait for (and require) a version of Python that provides that support. This is really hard for many reasons.</p> <p>The most common, and possibly the most reasonable for most needs, is to include the new implementations with your <tt class="file docutils literal"><span class="pre">setup.py</span></tt> script, and cause the <a class="reference internal" href="apiref.html#distutils.core.setup" title="distutils.core.setup"><tt class="xref py py-func docutils literal"><span class="pre">distutils.core.setup()</span></tt></a> function use them:</p> <div class="highlight-python"><pre>from distutils.command.build_py import build_py as _build_py from distutils.core import setup class build_py(_build_py): """Specialized Python source builder.""" # implement whatever needs to be different... setup(cmdclass={'build_py': build_py}, ...)</pre> </div> <p>This approach is most valuable if the new implementations must be used to use a particular package, as everyone interested in the package will need to have the new command implementation.</p> <p>Beginning with Python 2.4, a third option is available, intended to allow new commands to be added which can support existing <tt class="file docutils literal"><span class="pre">setup.py</span></tt> scripts without requiring modifications to the Python installation. This is expected to allow third-party extensions to provide support for additional packaging systems, but the commands can be used for anything distutils commands can be used for. A new configuration option, <em class="xref std std-option">command_packages</em> (command-line option <em class="xref std std-option">--command-packages</em>), can be used to specify additional packages to be searched for modules implementing commands. Like all distutils options, this can be specified on the command line or in a configuration file. This option can only be set in the <tt class="docutils literal"><span class="pre">[global]</span></tt> section of a configuration file, or before any commands on the command line. If set in a configuration file, it can be overridden from the command line; setting it to an empty string on the command line causes the default to be used. This should never be set in a configuration file provided with a package.</p> <p>This new option can be used to add any number of packages to the list of packages searched for command implementations; multiple package names should be separated by commas. When not specified, the search is only performed in the <a class="reference internal" href="apiref.html#module-distutils.command" title="distutils.command: This subpackage contains one module for each standard Distutils command."><tt class="xref py py-mod docutils literal"><span class="pre">distutils.command</span></tt></a> package. When <tt class="file docutils literal"><span class="pre">setup.py</span></tt> is run with the option <em class="xref std std-option">--command-packages</em> <em class="xref std std-option">distcmds,buildcmds</em>, however, the packages <a class="reference internal" href="apiref.html#module-distutils.command" title="distutils.command: This subpackage contains one module for each standard Distutils command."><tt class="xref py py-mod docutils literal"><span class="pre">distutils.command</span></tt></a>, <tt class="xref py py-mod docutils literal"><span class="pre">distcmds</span></tt>, and <tt class="xref py py-mod docutils literal"><span class="pre">buildcmds</span></tt> will be searched in that order. New commands are expected to be implemented in modules of the same name as the command by classes sharing the same name. Given the example command line option above, the command <strong class="command">bdist_openpkg</strong> could be implemented by the class <tt class="xref py py-class docutils literal"><span class="pre">distcmds.bdist_openpkg.bdist_openpkg</span></tt> or <tt class="xref py py-class docutils literal"><span class="pre">buildcmds.bdist_openpkg.bdist_openpkg</span></tt>.</p> </div> <div class="section" id="adding-new-distribution-types"> <h2>8.2. Adding new distribution types<a class="headerlink" href="#adding-new-distribution-types" title="Permalink to this headline">¶</a></h2> <p>Commands that create distributions (files in the <tt class="file docutils literal"><span class="pre">dist/</span></tt> directory) need to add <tt class="docutils literal"><span class="pre">(command,</span> <span class="pre">filename)</span></tt> pairs to <tt class="docutils literal"><span class="pre">self.distribution.dist_files</span></tt> so that <strong class="command">upload</strong> can upload it to PyPI. The <em>filename</em> in the pair contains no path information, only the name of the file itself. In dry-run mode, pairs should still be added to represent what would have been created.</p> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">8. Extending Distutils</a><ul> <li><a class="reference internal" href="#integrating-new-commands">8.1. Integrating new commands</a></li> <li><a class="reference internal" href="#adding-new-distribution-types">8.2. Adding new distribution types</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="examples.html" title="previous chapter">7. Examples</a></p> <h4>Next topic</h4> <p class="topless"><a href="commandref.html" title="next chapter">9. Command Reference</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/distutils/extending.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input 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> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <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="commandref.html" title="9. 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