Edit File: extending.html
<!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>9. Extending Distutils — Python v2.6.6 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: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 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 v2.6.6 documentation" href="../index.html" /> <link rel="up" title="Distributing Python Modules" href="index.html" /> <link rel="next" title="10. Command Reference" href="commandref.html" /> <link rel="prev" title="8. Examples" href="examples.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> </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="../modindex.html" title="Global Module Index" accesskey="M">modules</a> |</li> <li class="right" > <a href="commandref.html" title="10. Command Reference" accesskey="N">next</a> |</li> <li class="right" > <a href="examples.html" title="8. Examples" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 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>9. 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="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="docutils literal"><span class="pre">.py</span></tt> files as a convenience.</p> <p>Most distutils command implementations are subclasses of the <a title="distutils.cmd.Command" class="reference external" href="apiref.html#distutils.cmd.Command"><tt class="xref docutils literal"><span class="pre">distutils.cmd.Command</span></tt></a> class. New commands may directly inherit from <tt class="xref docutils literal"><span class="pre">Command</span></tt>, while replacements often derive from <tt class="xref 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 docutils literal"><span class="pre">Command</span></tt>.</p> <div class="section" id="integrating-new-commands"> <h2>9.1. 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="docutils literal"><span class="pre">setup.py</span></tt> script, and cause the <a title="distutils.core.setup" class="reference external" href="apiref.html#distutils.core.setup"><tt class="xref 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="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">command_packages</em> (command-line option <em class="xref">--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 title="This subpackage contains one module for each standard Distutils command." class="reference external" href="apiref.html#module-distutils.command"><tt class="xref docutils literal"><span class="pre">distutils.command</span></tt></a> package. When <tt class="docutils literal"><span class="pre">setup.py</span></tt> is run with the option <em class="xref">--command-packages</em> <em class="xref">distcmds,buildcmds</em>, however, the packages <a title="This subpackage contains one module for each standard Distutils command." class="reference external" href="apiref.html#module-distutils.command"><tt class="xref docutils literal"><span class="pre">distutils.command</span></tt></a>, <tt class="xref docutils literal"><span class="pre">distcmds</span></tt>, and <tt class="xref 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>bdist_openpkg</strong> could be implemented by the class <tt class="xref docutils literal"><span class="pre">distcmds.bdist_openpkg.bdist_openpkg</span></tt> or <tt class="xref docutils literal"><span class="pre">buildcmds.bdist_openpkg.bdist_openpkg</span></tt>.</p> </div> <div class="section" id="adding-new-distribution-types"> <h2>9.2. 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="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>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 external" href="#">9. Extending Distutils</a><ul> <li><a class="reference external" href="#integrating-new-commands">9.1. Integrating new commands</a></li> <li><a class="reference external" href="#adding-new-distribution-types">9.2. Adding new distribution types</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="examples.html" title="previous chapter">8. Examples</a></p> <h4>Next topic</h4> <p class="topless"><a href="commandref.html" title="next chapter">10. 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" size="18" /> <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="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="commandref.html" title="10. Command Reference" >next</a> |</li> <li class="right" > <a href="examples.html" title="8. Examples" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >Distributing Python Modules</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2011, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Jul 20, 2011. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 0.6.6. </div> </body> </html>
Back to File Manager