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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>Chapter 1. On the move to Python 3</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="index.html" title="Debian Python Policy" /><link rel="next" href="python.html" title="Chapter 2. Python Packaging" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 1. On the move to Python 3</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="python.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a id="python3"></a>Chapter 1. On the move to Python 3</h1></div></div></div><p>
	  Debian currently supports two Python stacks, one for Python 3
	  and one for Python 2.  The long term goal for Debian is to
	  reduce this to one stack, dropping the Python 2 stack at some
	  time.
	</p><p>
	  <a class="ulink" href="https://www.python.org/dev/peps/pep-0404/" target="_blank">PEP 404</a> states that no more major Python 2 releases
	  are planned, although the latest released minor version 2.7
	  will see some extended support, documented in
	  <a class="ulink" href="https://www.python.org/dev/peps/pep-0466/" target="_blank">PEP 466</a>.
	</p><p>
	  Packages in Debian should use Python 3 if Python 3 is
	  supported.  New packages should use Python 3 from the initial
	  upload, new upstream versions for existing packages should
	  use Python 3 if the new upstream version supports it.
	</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
	      Programs should use Python 3, and should not be packaged
	      for Python 2 as well.  Python 3 should be used for the
	      packaging if the packaging scripts use Python.
	    </p></li><li class="listitem"><p>
	      Python libraries, if they support Python 3, should be always
	      packaged for Python 3. If an application supports only Python
	      2, the Python libraries for that application should also be
	      packaged for Python 2.
	    </p></li><li class="listitem"><p>
	      Existing Python 2 libraries should not be dropped before
	      the last reverse dependency is removed.
	    </p></li></ol></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="python.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Debian Python Policy </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 2. Python Packaging</td></tr></table></div></body></html>