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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. Completing 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. Completing 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. Completing the move to Python 3</h1></div></div></div><p>
Debian has previously supported two Python stacks, one for Python 3
and one for Python 2. The goal for Debian is to reduce this
to one stack, dropping the Python 2 stack and interpreter for
the Bullseye release.
</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. New packages must
use Python 3 from the initial upload, new upstream versions
for existing packages must use Python 3. If Python 2 is still
supported in Bullseye, selected packages may continue using
Python 2 until Python 3 support is available for those packages.
Please discuss all use of Python 2 on the debian-python
mailing list before uploading.
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
Applications should use Python 3 and must not be packaged
for Python 2 as well. If an application supports only
Python 2, the application may need to be removed from
Debian so that it does not block removal of other Python 2
packages.
</p></li><li class="listitem"><p>
Python libraries need to support Python 3 and new versions
must be packaged for Python 3. Existing Python 2 libraries
must not be dropped before the last reverse dependency is
removed. New Python 2 libraries must not be introduced.
</p></li><li class="listitem"><p>
Python 3 should be used for the packaging if the
packaging scripts use Python.
</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>
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