mirror of https://github.com/python/peps
303 lines
16 KiB
HTML
303 lines
16 KiB
HTML
|
||
<!DOCTYPE html>
|
||
<html lang="en">
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||
<meta name="color-scheme" content="light dark">
|
||
<title>PEP 3003 – Python Language Moratorium | peps.python.org</title>
|
||
<link rel="shortcut icon" href="../_static/py.png">
|
||
<link rel="canonical" href="https://peps.python.org/pep-3003/">
|
||
<link rel="stylesheet" href="../_static/style.css" type="text/css">
|
||
<link rel="stylesheet" href="../_static/mq.css" type="text/css">
|
||
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" media="(prefers-color-scheme: light)" id="pyg-light">
|
||
<link rel="stylesheet" href="../_static/pygments_dark.css" type="text/css" media="(prefers-color-scheme: dark)" id="pyg-dark">
|
||
<link rel="alternate" type="application/rss+xml" title="Latest PEPs" href="https://peps.python.org/peps.rss">
|
||
<meta property="og:title" content='PEP 3003 – Python Language Moratorium | peps.python.org'>
|
||
<meta property="og:type" content="website">
|
||
<meta property="og:url" content="https://peps.python.org/pep-3003/">
|
||
<meta property="og:site_name" content="Python Enhancement Proposals (PEPs)">
|
||
<meta property="og:image" content="https://peps.python.org/_static/og-image.png">
|
||
<meta property="og:image:alt" content="Python PEPs">
|
||
<meta property="og:image:width" content="200">
|
||
<meta property="og:image:height" content="200">
|
||
<meta name="description" content="Python Enhancement Proposals (PEPs)">
|
||
<meta name="theme-color" content="#3776ab">
|
||
</head>
|
||
<body>
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
|
||
<symbol id="svg-sun-half" viewBox="0 0 24 24" pointer-events="all">
|
||
<title>Following system colour scheme</title>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none"
|
||
stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
|
||
<circle cx="12" cy="12" r="9"></circle>
|
||
<path d="M12 3v18m0-12l4.65-4.65M12 14.3l7.37-7.37M12 19.6l8.85-8.85"></path>
|
||
</svg>
|
||
</symbol>
|
||
<symbol id="svg-moon" viewBox="0 0 24 24" pointer-events="all">
|
||
<title>Selected dark colour scheme</title>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none"
|
||
stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
|
||
<path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
|
||
<path d="M12 3c.132 0 .263 0 .393 0a7.5 7.5 0 0 0 7.92 12.446a9 9 0 1 1 -8.313 -12.454z"></path>
|
||
</svg>
|
||
</symbol>
|
||
<symbol id="svg-sun" viewBox="0 0 24 24" pointer-events="all">
|
||
<title>Selected light colour scheme</title>
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none"
|
||
stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
|
||
<circle cx="12" cy="12" r="5"></circle>
|
||
<line x1="12" y1="1" x2="12" y2="3"></line>
|
||
<line x1="12" y1="21" x2="12" y2="23"></line>
|
||
<line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line>
|
||
<line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line>
|
||
<line x1="1" y1="12" x2="3" y2="12"></line>
|
||
<line x1="21" y1="12" x2="23" y2="12"></line>
|
||
<line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line>
|
||
<line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line>
|
||
</svg>
|
||
</symbol>
|
||
</svg>
|
||
<script>
|
||
|
||
document.documentElement.dataset.colour_scheme = localStorage.getItem("colour_scheme") || "auto"
|
||
</script>
|
||
<section id="pep-page-section">
|
||
<header>
|
||
<h1>Python Enhancement Proposals</h1>
|
||
<ul class="breadcrumbs">
|
||
<li><a href="https://www.python.org/" title="The Python Programming Language">Python</a> » </li>
|
||
<li><a href="../pep-0000/">PEP Index</a> » </li>
|
||
<li>PEP 3003</li>
|
||
</ul>
|
||
<button id="colour-scheme-cycler" onClick="setColourScheme(nextColourScheme())">
|
||
<svg aria-hidden="true" class="colour-scheme-icon-when-auto"><use href="#svg-sun-half"></use></svg>
|
||
<svg aria-hidden="true" class="colour-scheme-icon-when-dark"><use href="#svg-moon"></use></svg>
|
||
<svg aria-hidden="true" class="colour-scheme-icon-when-light"><use href="#svg-sun"></use></svg>
|
||
<span class="visually-hidden">Toggle light / dark / auto colour theme</span>
|
||
</button>
|
||
</header>
|
||
<article>
|
||
<section id="pep-content">
|
||
<h1 class="page-title">PEP 3003 – Python Language Moratorium</h1>
|
||
<dl class="rfc2822 field-list simple">
|
||
<dt class="field-odd">Author<span class="colon">:</span></dt>
|
||
<dd class="field-odd">Brett Cannon, Jesse Noller, Guido van Rossum</dd>
|
||
<dt class="field-even">Status<span class="colon">:</span></dt>
|
||
<dd class="field-even"><abbr title="Accepted and implementation complete, or no longer active">Final</abbr></dd>
|
||
<dt class="field-odd">Type<span class="colon">:</span></dt>
|
||
<dd class="field-odd"><abbr title="Normative PEP describing or proposing a change to a Python community process, workflow or governance">Process</abbr></dd>
|
||
<dt class="field-even">Created<span class="colon">:</span></dt>
|
||
<dd class="field-even">21-Oct-2009</dd>
|
||
<dt class="field-odd">Post-History<span class="colon">:</span></dt>
|
||
<dd class="field-odd">03-Nov-2009</dd>
|
||
</dl>
|
||
<hr class="docutils" />
|
||
<section id="contents">
|
||
<details><summary>Table of Contents</summary><ul class="simple">
|
||
<li><a class="reference internal" href="#abstract">Abstract</a></li>
|
||
<li><a class="reference internal" href="#rationale">Rationale</a></li>
|
||
<li><a class="reference internal" href="#details">Details</a><ul>
|
||
<li><a class="reference internal" href="#cannot-change">Cannot Change</a></li>
|
||
<li><a class="reference internal" href="#case-by-case-exemptions">Case-by-Case Exemptions</a></li>
|
||
<li><a class="reference internal" href="#allowed-to-change">Allowed to Change</a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a class="reference internal" href="#retroactive">Retroactive</a></li>
|
||
<li><a class="reference internal" href="#extensions">Extensions</a></li>
|
||
<li><a class="reference internal" href="#copyright">Copyright</a></li>
|
||
<li><a class="reference internal" href="#references">References</a></li>
|
||
</ul>
|
||
</details></section>
|
||
<section id="abstract">
|
||
<h2><a class="toc-backref" href="#abstract" role="doc-backlink">Abstract</a></h2>
|
||
<p>This PEP proposes a temporary moratorium (suspension) of all changes
|
||
to the Python language syntax, semantics, and built-ins for a period
|
||
of at least two years from the release of Python 3.1. In particular, the
|
||
moratorium would include Python 3.2 (to be released 18-24 months after
|
||
3.1) but allow Python 3.3 (assuming it is not released prematurely) to
|
||
once again include language changes.</p>
|
||
<p>This suspension of features is designed to allow non-CPython implementations
|
||
to “catch up” to the core implementation of the language, help ease adoption
|
||
of Python 3.x, and provide a more stable base for the community.</p>
|
||
</section>
|
||
<section id="rationale">
|
||
<h2><a class="toc-backref" href="#rationale" role="doc-backlink">Rationale</a></h2>
|
||
<p>This idea was proposed by Guido van Rossum on the python-ideas <a class="footnote-reference brackets" href="#id6" id="id1">[1]</a> mailing
|
||
list. The premise of his email was to slow the alteration of the Python core
|
||
syntax, builtins and semantics to allow non-CPython implementations to catch
|
||
up to the current state of Python, both 2.x and 3.x.</p>
|
||
<p>Python, as a language is more than the core implementation –
|
||
CPython – with a rich, mature and vibrant community of implementations, such
|
||
as Jython <a class="footnote-reference brackets" href="#id7" id="id2">[2]</a>, IronPython <a class="footnote-reference brackets" href="#id8" id="id3">[3]</a> and PyPy <a class="footnote-reference brackets" href="#id9" id="id4">[4]</a> that are a benefit not only to
|
||
the community, but to the language itself.</p>
|
||
<p>Still others, such as Unladen Swallow <a class="footnote-reference brackets" href="#id10" id="id5">[5]</a> (a branch of CPython) seek not to
|
||
create an alternative implementation, but rather they seek to enhance the
|
||
performance and implementation of CPython itself.</p>
|
||
<p>Python 3.x was a large part of the last several years of Python’s
|
||
development. Its release, as well as a bevy of changes to the language
|
||
introduced by it and the previous 2.6.x releases, puts alternative
|
||
implementations at a severe disadvantage in “keeping pace” with core python
|
||
development.</p>
|
||
<p>Additionally, many of the changes put into the recent releases of the language
|
||
as implemented by CPython have not yet seen widespread usage by the
|
||
general user population. For example, most users are limited to the version
|
||
of the interpreter (typically CPython) which comes pre-installed with their
|
||
operating system. Most OS vendors are just barely beginning to ship Python 2.6
|
||
– even fewer are shipping Python 3.x.</p>
|
||
<p>As it is expected that Python 2.7 be the effective “end of life” of the Python
|
||
2.x code line, with Python 3.x being the future, it is in the best interest of
|
||
Python core development to temporarily suspend the alteration of the language
|
||
itself to allow all of these external entities to catch up and to assist in
|
||
the adoption of, and migration to, Python 3.x</p>
|
||
<p>Finally, the moratorium is intended to free up cycles within core development
|
||
to focus on other issues, such as the CPython interpreter and improvements
|
||
therein, the standard library, etc.</p>
|
||
<p>This moratorium does not allow for exceptions – once accepted, any pending
|
||
changes to the syntax or semantics of the language will be postponed until the
|
||
moratorium is lifted.</p>
|
||
<p>This moratorium does not attempt to apply to any other Python implementation
|
||
meaning that if desired other implementations may add features which deviate
|
||
from the standard implementation.</p>
|
||
</section>
|
||
<section id="details">
|
||
<h2><a class="toc-backref" href="#details" role="doc-backlink">Details</a></h2>
|
||
<section id="cannot-change">
|
||
<h3><a class="toc-backref" href="#cannot-change" role="doc-backlink">Cannot Change</a></h3>
|
||
<ul class="simple">
|
||
<li>New built-ins</li>
|
||
<li><dl class="simple">
|
||
<dt>Language syntax</dt><dd>The grammar file essentially becomes immutable apart from ambiguity
|
||
fixes.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>General language semantics</dt><dd>The language operates as-is with only specific exemptions (see
|
||
below).</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>New __future__ imports</dt><dd>These are explicitly forbidden, as they effectively change the language
|
||
syntax and/or semantics (albeit using a compiler directive).</dd>
|
||
</dl>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="case-by-case-exemptions">
|
||
<h3><a class="toc-backref" href="#case-by-case-exemptions" role="doc-backlink">Case-by-Case Exemptions</a></h3>
|
||
<ul class="simple">
|
||
<li><dl class="simple">
|
||
<dt>New methods on built-ins</dt><dd>The case for adding a method to a built-in object can be made.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>Incorrect language semantics</dt><dd>If the language semantics turn out to be ambiguous or improperly
|
||
implemented based on the intention of the original design then the
|
||
semantics may change.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>Language semantics that are difficult to implement</dt><dd>Because other VMs have not begun implementing Python 3.x semantics
|
||
there is a possibility that certain semantics are too difficult to
|
||
replicate. In those cases they can be changed to ease adoption of
|
||
Python 3.x by the other VMs.</dd>
|
||
</dl>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section id="allowed-to-change">
|
||
<h3><a class="toc-backref" href="#allowed-to-change" role="doc-backlink">Allowed to Change</a></h3>
|
||
<ul class="simple">
|
||
<li><dl class="simple">
|
||
<dt>C API</dt><dd>It is entirely acceptable to change the underlying C code of
|
||
CPython as long as other restrictions of this moratorium are not
|
||
broken. E.g. removing the GIL would be fine assuming certain
|
||
operations that are currently atomic remain atomic.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>The standard library</dt><dd>As the standard library is not directly tied to the language
|
||
definition it is not covered by this moratorium.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>Backports of 3.x features to 2.x</dt><dd>The moratorium only affects features that would be new in 3.x.</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>Import semantics</dt><dd>For example, <a class="pep reference internal" href="../pep-0382/" title="PEP 382 – Namespace Packages">PEP 382</a>. After all, import semantics vary between
|
||
Python implementations anyway.</dd>
|
||
</dl>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
</section>
|
||
<section id="retroactive">
|
||
<h2><a class="toc-backref" href="#retroactive" role="doc-backlink">Retroactive</a></h2>
|
||
<p>It is important to note that the moratorium covers all changes since the release
|
||
of Python 3.1. This rule is intended to avoid features being rushed or smuggled
|
||
into the CPython source tree while the moratorium is being discussed. A review
|
||
of the NEWS file for the py3k development branch showed no commits would need to
|
||
be rolled back in order to meet this goal.</p>
|
||
</section>
|
||
<section id="extensions">
|
||
<h2><a class="toc-backref" href="#extensions" role="doc-backlink">Extensions</a></h2>
|
||
<p>The time period of the moratorium can only be extended through a new PEP.</p>
|
||
</section>
|
||
<section id="copyright">
|
||
<h2><a class="toc-backref" href="#copyright" role="doc-backlink">Copyright</a></h2>
|
||
<p>This document has been placed in the public domain.</p>
|
||
</section>
|
||
<section id="references">
|
||
<h2><a class="toc-backref" href="#references" role="doc-backlink">References</a></h2>
|
||
<aside class="footnote-list brackets">
|
||
<aside class="footnote brackets" id="id6" role="doc-footnote">
|
||
<dt class="label" id="id6">[<a href="#id1">1</a>]</dt>
|
||
<dd><a class="reference external" href="https://mail.python.org/pipermail/python-ideas/2009-October/006305.html">https://mail.python.org/pipermail/python-ideas/2009-October/006305.html</a></aside>
|
||
<aside class="footnote brackets" id="id7" role="doc-footnote">
|
||
<dt class="label" id="id7">[<a href="#id2">2</a>]</dt>
|
||
<dd><a class="reference external" href="http://www.jython.org/">http://www.jython.org/</a></aside>
|
||
<aside class="footnote brackets" id="id8" role="doc-footnote">
|
||
<dt class="label" id="id8">[<a href="#id3">3</a>]</dt>
|
||
<dd><a class="reference external" href="http://www.codeplex.com/IronPython">http://www.codeplex.com/IronPython</a></aside>
|
||
<aside class="footnote brackets" id="id9" role="doc-footnote">
|
||
<dt class="label" id="id9">[<a href="#id4">4</a>]</dt>
|
||
<dd><a class="reference external" href="http://codespeak.net/pypy/">http://codespeak.net/pypy/</a></aside>
|
||
<aside class="footnote brackets" id="id10" role="doc-footnote">
|
||
<dt class="label" id="id10">[<a href="#id5">5</a>]</dt>
|
||
<dd><a class="reference external" href="http://code.google.com/p/unladen-swallow/">http://code.google.com/p/unladen-swallow/</a></aside>
|
||
</aside>
|
||
</section>
|
||
</section>
|
||
<hr class="docutils" />
|
||
<p>Source: <a class="reference external" href="https://github.com/python/peps/blob/main/peps/pep-3003.rst">https://github.com/python/peps/blob/main/peps/pep-3003.rst</a></p>
|
||
<p>Last modified: <a class="reference external" href="https://github.com/python/peps/commits/main/peps/pep-3003.rst">2023-09-09 17:39:29 GMT</a></p>
|
||
|
||
</article>
|
||
<nav id="pep-sidebar">
|
||
<h2>Contents</h2>
|
||
<ul>
|
||
<li><a class="reference internal" href="#abstract">Abstract</a></li>
|
||
<li><a class="reference internal" href="#rationale">Rationale</a></li>
|
||
<li><a class="reference internal" href="#details">Details</a><ul>
|
||
<li><a class="reference internal" href="#cannot-change">Cannot Change</a></li>
|
||
<li><a class="reference internal" href="#case-by-case-exemptions">Case-by-Case Exemptions</a></li>
|
||
<li><a class="reference internal" href="#allowed-to-change">Allowed to Change</a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a class="reference internal" href="#retroactive">Retroactive</a></li>
|
||
<li><a class="reference internal" href="#extensions">Extensions</a></li>
|
||
<li><a class="reference internal" href="#copyright">Copyright</a></li>
|
||
<li><a class="reference internal" href="#references">References</a></li>
|
||
</ul>
|
||
|
||
<br>
|
||
<a id="source" href="https://github.com/python/peps/blob/main/peps/pep-3003.rst">Page Source (GitHub)</a>
|
||
</nav>
|
||
</section>
|
||
<script src="../_static/colour_scheme.js"></script>
|
||
<script src="../_static/wrap_tables.js"></script>
|
||
<script src="../_static/sticky_banner.js"></script>
|
||
</body>
|
||
</html> |