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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>Appendix C. Upgrade Procedure</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="Debian Python Policy" /><link rel="up" href="index.html" title="Debian Python Policy" /><link rel="prev" href="packaging_tools.html" title="Appendix B. Packaging Tools" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix C. Upgrade Procedure</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="packaging_tools.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> </td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="upgrade"></a>Appendix C. Upgrade Procedure</h1></div></div></div><p>
	This section describes the procedure for the upgrade when the
	default Python version is changed in the Debian <code class="literal">unstable</code>
	release, requiring recompilation of many Python-related packages.
      </p><p>
	</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
	      Selected pre-releases and release candidates of new Python
	      versions are uploaded to Debian <code class="literal">experimental</code> to
	      support pre-transition work and testing.
	    </p></li><li class="listitem"><p>
	      Application and module maintainers make sourceful changes
	      where needed to prepare for the new Python version when
	      needed.
	    </p></li><li class="listitem"><p>
	      Have a long and heated discussion.
	    </p></li><li class="listitem"><p>
	      The Debian Python maintainer and module/application
	      maintainers discuss the readiness for a new default Debian
	      Python version and associated packaging/policy changes. Once
	      there is some consensus, the Python maintainer announces the
	      upgrade and uploads to <code class="literal">unstable</code>.
	    </p></li><li class="listitem"><p>
	      Upload of the Python core meta-packages <code class="literal">python3</code>,
	      <code class="literal">python3-dev</code>, <code class="literal">python3-doc</code> and
	      several <code class="literal">python3-<em class="replaceable"><code>module</code></em></code>, depending on
	      the new <code class="literal">python3<em class="replaceable"><code>X</code></em>.<em class="replaceable"><code>Y</code></em></code>,
	      <code class="literal">python<em class="replaceable"><code>X</code></em>.<em class="replaceable"><code>Y</code></em>-dev</code> and so on.
	    </p></li><li class="listitem"><p>
	      The Debian release team schedules rebuilds for packages that
	      may need it. Packages that require additional manual work get
	      updated and uploaded.
	    </p></li></ol></div><p>
      </p><p>
	The necessary package builds are typcially done in three phases in
	order to keep transitions as smooth as possible. For Python 3, there
	is no general need to update architecture all packages for a new
	Python 3 version. Only architecture any packages need to be rebuilt.
	</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
	      The new Python 3 version is added to supported versions and
	      packages that support multiple Python 3 versions are binNMUed.
	      They now support both the new and older Python 3 versions.
	      This requires transition assistance from the release team in
	      the form of a transition tracker and binNMU scheduling, but is
	      not a transition that can cause entanglements with other
	      transitions in Debian.
	    </p></li><li class="listitem"><p>
	      Once the default Python 3 version is changed, binNMUs are done
	      for packages that only support one Python 3 version. Some
	      transient uninstallability is unavoidable. This is a
	      transition that can entangle other transitions in Debian and
	      requires more careful coordination with the release team.
	    </p></li><li class="listitem"><p>
	      After the old Python 3 version is dropped from supported
	      versions then packages with multi-version support are binNMUed
	      again to remove support for the old Python 3 version. This is
	      not a true transition and only needs a tracker and binNMU
	scheduling.
	</p></li></ol></div><p>
      </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="packaging_tools.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top">Appendix B. Packaging Tools </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>