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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>Debian Python Policy - On the move to Python 3</title> <link href="index.html" rel="start"> <link href="index.html" rel="prev"> <link href="ch-python.html" rel="next"> <link href="index.html#contents" rel="contents"> <link href="index.html#copyright" rel="copyright"> <link href="ch-python3.html" rel="chapter" title="1 On the move to Python 3"> <link href="ch-python.html" rel="chapter" title="2 Python Packaging"> <link href="ch-module_packages.html" rel="chapter" title="3 Packaged Modules"> <link href="ch-programs.html" rel="chapter" title="4 Python Programs"> <link href="ch-embed.html" rel="chapter" title="5 Programs Embedding Python"> <link href="ch-other.html" rel="chapter" title="6 Interaction with Locally Installed Python Versions"> <link href="ap-build_dependencies.html" rel="appendix" title="A Build Dependencies"> <link href="ap-packaging_tools.html" rel="appendix" title="B Packaging Tools"> <link href="ap-upgrade.html" rel="appendix" title="C Upgrade Procedure"> <link href="ch-python.html#s-versions" rel="section" title="2.1 Versions"> <link href="ch-python.html#s-base" rel="section" title="2.2 Main packages"> <link href="ch-python.html#s-minimal" rel="section" title="2.3 Minimal packages"> <link href="ch-python.html#s-interpreter" rel="section" title="2.4 Python Interpreter"> <link href="ch-python.html#s-paths" rel="section" title="2.5 Module Path"> <link href="ch-python.html#s-runtimes_hooks" rel="section" title="2.6 Hooks for updates to installed runtimes"> <link href="ch-python.html#s-docs" rel="section" title="2.7 Documentation"> <link href="ch-module_packages.html#s3.1" rel="section" title="3.1 Types of Python Modules"> <link href="ch-module_packages.html#s-wheels" rel="section" title="3.2 Wheels"> <link href="ch-module_packages.html#s-package_names" rel="section" title="3.3 Module Package Names"> <link href="ch-module_packages.html#s-specifying_versions" rel="section" title="3.4 Specifying Supported Versions"> <link href="ch-module_packages.html#s-dependencies" rel="section" title="3.5 Dependencies"> <link href="ch-module_packages.html#s-provides" rel="section" title="3.6 Provides"> <link href="ch-module_packages.html#s-byte_compilation" rel="section" title="3.7 Modules Byte-Compilation"> <link href="ch-programs.html#s-interpreter-directive" rel="section" title="4.1 Interpreter directive (“Shebang”)"> <link href="ch-programs.html#s-version_indep_progs" rel="section" title="4.2 Programs using the default Python"> <link href="ch-programs.html#s-version_dep_progs" rel="section" title="4.3 Programs Using a Particular Python Version"> <link href="ch-embed.html#s-build_embedded" rel="section" title="5.1 Building Embedded Programs"> <link href="ch-embed.html#s-embedded_deps" rel="section" title="5.2 Embedded Python Dependencies"> <link href="ap-packaging_tools.html#s-distutils" rel="section" title="B.1 distutils"> <link href="ap-packaging_tools.html#s-setuptools" rel="section" title="B.2 setuptools"> <link href="ap-packaging_tools.html#s-dh-python" rel="section" title="B.3 dh-python"> <link href="ap-packaging_tools.html#s-pybuild" rel="section" title="B.4 pybuild"> <link href="ap-packaging_tools.html#s-cdbs" rel="section" title="B.5 CDBS"> <link href="ap-packaging_tools.html#s-pysupport" rel="section" title="B.6 python-support (removed)"> <link href="ap-packaging_tools.html#s-pycentral" rel="section" title="B.7 python-central (removed)"> <link href="ch-python.html#s-interpreter_name" rel="subsection" title="2.4.1 Interpreter Name"> <link href="ch-python.html#s-interpreter_loc" rel="subsection" title="2.4.2 Interpreter Location"> <link href="ch-programs.html#s-current_version_progs" rel="subsection" title="4.2.1 Programs Shipping Private Modules"> </head> <body> <p><a name="ch-python3"></a></p> <hr> <p> [ <a href="index.html">previous</a> ] [ <a href="index.html#contents">Contents</a> ] [ 1 ] [ <a href="ch-python.html">2</a> ] [ <a href="ch-module_packages.html">3</a> ] [ <a href="ch-programs.html">4</a> ] [ <a href="ch-embed.html">5</a> ] [ <a href="ch-other.html">6</a> ] [ <a href="ap-build_dependencies.html">A</a> ] [ <a href="ap-packaging_tools.html">B</a> ] [ <a href="ap-upgrade.html">C</a> ] [ <a href="ch-python.html">next</a> ] </p> <hr> <h1> Debian Python Policy <br>Chapter 1 - On the move to Python 3 </h1> <hr> <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> <code><a href="https://www.python.org/dev/peps/pep-0404/">PEP 404</a></code> 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 <code><a href="https://www.python.org/dev/peps/pep-0466/">PEP 466</a></code>. </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> <ol type="1" start="1" > <li> <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> </ol> <ol type="1" start="2" > <li> <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> </ol> <ol type="1" start="3" > <li> <p> Existing Python 2 libraries should not be dropped before the last reverse dependency is removed. </p> </li> </ol> <hr> <p> [ <a href="index.html">previous</a> ] [ <a href="index.html#contents">Contents</a> ] [ 1 ] [ <a href="ch-python.html">2</a> ] [ <a href="ch-module_packages.html">3</a> ] [ <a href="ch-programs.html">4</a> ] [ <a href="ch-embed.html">5</a> ] [ <a href="ch-other.html">6</a> ] [ <a href="ap-build_dependencies.html">A</a> ] [ <a href="ap-packaging_tools.html">B</a> ] [ <a href="ap-upgrade.html">C</a> ] [ <a href="ch-python.html">next</a> ] </p> <hr> <p> Debian Python Policy </p> <address> version 0.10.1.1<br> <br> Neil Schemenauer <code><a href="mailto:nas@debian.org">mailto:nas@debian.org</a></code><br> Matthias Klose <code><a href="mailto:doko@debian.org">mailto:doko@debian.org</a></code><br> Gregor Hoffleit <code><a href="mailto:flight@debian.org">mailto:flight@debian.org</a></code><br> Josselin Mouette <code><a href="mailto:joss@debian.org">mailto:joss@debian.org</a></code><br> Joe Wreschnig <code><a href="mailto:piman@debian.org">mailto:piman@debian.org</a></code><br> Loïc Minier <code><a href="mailto:lool@debian.org">mailto:lool@debian.org</a></code><br> Scott Kitterman <code><a href="mailto:scott@kitterman.com">mailto:scott@kitterman.com</a></code><br> Barry Warsaw <code><a href="mailto:barry@debian.org">mailto:barry@debian.org</a></code><br> Ben Finney <code><a href="mailto:ben+debian@benfinney.id.au">mailto:ben+debian@benfinney.id.au</a></code><br> <br> </address> <hr> </body> </html>