1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
|
<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1"><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
<title>Language-specific policies — Gentoo Policy Guide documentation</title>
<link rel="stylesheet" href="_static/tyrian-sphinx-theme.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="_static/custom.css" type="text/css" />
<link rel="icon" href="https://www.gentoo.org/favicon.ico" type="image/x-icon">
<link href="https://assets.gentoo.org/tyrian/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="https://assets.gentoo.org/tyrian/tyrian.min.css" rel="stylesheet" media="screen">
<link rel="stylesheet" type="text/css" href="_static/pygments.css" />
<link rel="stylesheet" type="text/css" href="_static/tyrian-sphinx-theme.css" />
<script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
<script data-url_root="./" id="documentation_options" src="_static/documentation_options.js"></script>
<script src="_static/jquery.js"></script>
<script src="_static/underscore.js"></script>
<script src="_static/doctools.js"></script>
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="Package Maintainers" href="maintainer.html" />
<link rel="prev" title="Keywording and stabilization" href="keywords.html" />
</head><body>
<header>
<div class="site-title">
<div class="container">
<div class="row">
<div class="site-title-buttons">
<div class="btn-group btn-group-sm">
<a href="https://get.gentoo.org/" role="button" class="btn get-gentoo"><span class="fa fa-fw fa-download"></span> <strong>Get Gentoo!</strong></a>
<div class="btn-group btn-group-sm">
<a class="btn gentoo-org-sites dropdown-toggle" data-toggle="dropdown" data-target="#" href="#">
<span class="fa fa-fw fa-map-o"></span> <span class="hidden-xs">gentoo.org sites</span> <span class="caret"></span>
</a>
<ul class="dropdown-menu dropdown-menu-right">
<li><a href="https://www.gentoo.org/" title="Main Gentoo website"><span class="fa fa-home fa-fw"></span> gentoo.org</a></li>
<li><a href="https://wiki.gentoo.org/" title="Find and contribute documentation"><span class="fa fa-file-text-o fa-fw"></span> Wiki</a></li>
<li><a href="https://bugs.gentoo.org/" title="Report issues and find common issues"><span class="fa fa-bug fa-fw"></span> Bugs</a></li>
<li><a href="https://forums.gentoo.org/" title="Discuss with the community"><span class="fa fa-comments-o fa-fw"></span> Forums</a></li>
<li><a href="https://packages.gentoo.org/" title="Find software for your Gentoo"><span class="fa fa-hdd-o fa-fw"></span> Packages</a></li>
<li class="divider"></li>
<li><a href="https://planet.gentoo.org/" title="Find out what's going on in the developer community"><span class="fa fa-rss fa-fw"></span> Planet</a></li>
<li><a href="https://archives.gentoo.org/" title="Read up on past discussions"><span class="fa fa-archive fa-fw"></span> Archives</a></li>
<li><a href="https://sources.gentoo.org/" title="Browse our source code"><span class="fa fa-code fa-fw"></span> Sources</a></li>
<li class="divider"></li>
<li><a href="https://infra-status.gentoo.org/" title="Get updates on the services provided by Gentoo"><span class="fa fa-server fa-fw"></span> Infra Status</a></li>
</ul>
</div>
</div>
</div>
<div class="logo">
<a href="index.html" title="Back to the homepage" class="site-logo"></a>
<span class="site-label"> Policy Guide </span>
</div>
</div>
</div>
</div>
<nav class="tyrian-navbar" role="navigation">
<div class="container">
<div class="row">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-main-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="collapse navbar-collapse navbar-main-collapse">
<ul class="nav navbar-nav">
<li>
<a href="index.html">Home</a></li>
<li class=""><a href="_sources/languages.rst.txt">Source</a></li>
<li>
<a href="search.html">Search</a></li>
<li>
<a href="genindex.html">General Index</a>
</li>
<li>
<a href="std-policy-index.html">Policy Index</a>
</li>
</ul>
<form action="search.html" class="navbar-form navbar-right" method="get" onsubmit="if (this.quicksearch.value == '')
{ alert('Please enter one or more search terms first.');
return false; } return true;">
<div class="input-group" style="margin-top:2px;">
<span class="input-group-addon" style="background:#61597b;color:#FFF;border:0px;" id="basic-addon1"><i class="fa fa-search" aria-hidden="true"></i></span>
<input class="form-control" style="height:30px;border:0px;background:#61597b;color:#FFF;padding-left:0px;box-shadow: none;" type="text" id="quicksearch_top" name="q" title="Quick Search" placeholder="Quick Search" value="">
</div>
<button class="btn btn-default hidden" type="submit" value="Search" id="find_top">Search</button>
</form>
</div>
</div>
</div>
</nav>
</header>
<div class="container">
<div class="row">
<div class="col-md-9 col-sm-12 col-xs-12" role="main">
<section id="language-specific-policies">
<h1>Language-specific policies<a class="headerlink" href="#language-specific-policies" title="Permalink to this headline">¶</a></h1>
<section id="python">
<span id="index-0"></span><h2>Python<a class="headerlink" href="#python" title="Permalink to this headline">¶</a></h2>
<span class="target" id="index-1"></span><span class="target" id="index-2"></span><span class="target" id="index-3"></span><section id="pg0501">
<span id="eclass-usage"></span><span id="index-4"></span><h3>Eclass usage<a class="headerlink" href="#pg0501" title="Permalink to this headline">¶</a></h3>
<dl class="field-list simple">
<dt class="field-odd">PG</dt>
<dd class="field-odd"><p>0501</p>
</dd>
<dt class="field-even">Source</dt>
<dd class="field-even"><p>Python project</p>
</dd>
<dt class="field-odd">Reference</dt>
<dd class="field-odd"><p><a class="reference external" href="https://wiki.gentoo.org/wiki/Project:Python/Eclasses">https://wiki.gentoo.org/wiki/Project:Python/Eclasses</a></p>
</dd>
<dt class="field-even">Reported</dt>
<dd class="field-even"><p>by pkgcheck</p>
</dd>
</dl>
<p>All packages using Python (either through installing Python modules
or scripts, linking to libpython, calling Python at runtime or build
time) must do it through one of the python-r1 eclasses. Packages must
not directly depend on Python, directly use PYTHON_SINGLE_TARGET
or PYTHON_TARGETS. The variables and functions provided by the eclasses
must be used instead.</p>
<p>All ebuilds must explicitly define supported Python implementations
in PYTHON_COMPAT. Dependencies between Python packages must use
PYTHON_USEDEP, PYTHON_SINGLE_USEDEP or python_gen_cond_dep in order
to ensure implementation match.</p>
<p><em>Rationale</em>: the eclass code guarantees consistent and reliable handling
of slotted Python. It ensures that the whole dependency graph uses
matching implementation and that programs will not accidentally break
if user changes his Python preferences. The helper functions
and variables also make it possible to gracefully retire old
implementations with minimal changes to existing ebuilds.</p>
</section>
<section id="pg0502">
<span id="python-2-deprecation"></span><span id="index-5"></span><h3>Python 2 deprecation<a class="headerlink" href="#pg0502" title="Permalink to this headline">¶</a></h3>
<dl class="field-list simple">
<dt class="field-odd">PG</dt>
<dd class="field-odd"><p>0502</p>
</dd>
<dt class="field-even">Source</dt>
<dd class="field-even"><p>Python project</p>
</dd>
<dt class="field-odd">Reference</dt>
<dd class="field-odd"><p><a class="reference external" href="https://wiki.gentoo.org/wiki/Project:Python#Python_2_end-of-life">https://wiki.gentoo.org/wiki/Project:Python#Python_2_end-of-life</a></p>
</dd>
<dt class="field-even">Reported</dt>
<dd class="field-even"><p>no</p>
</dd>
</dl>
<p>Python 2 is being phased out of Gentoo packages. Python 2 support
must not be introduced in new packages, unless explicitly required
to maintain compatibility with existing packages. Packages that do not
support Python 3 should be removed sooner or later, depending
on Python 3 porting chances.</p>
<p>In packages that support both Python 2 and Python 3, the Python 2
support should be gracefully retired, as soon as their reverse
dependencies are ready or removed.</p>
<p><em>Rationale</em>: Python 2 has reached its (deferred) end-of-life by the end
of 2019. Many important upstream projects have already removed support
for Python 2. Those packages are frequently dependencies of other
packages, causing the cost of maintaining Python 2 support to grow
exponentially.</p>
<p>Early removal of unnecessary Python 2 support will both reduce
the long-term maintenance costs, and give users better chance to prepare
than delaying it until the number of packages losing Python 2 support
will cause major upgrade issues.</p>
</section>
</section>
</section>
<div class="row" style="margin-top:50px;">
<div class="col-sm-6">
<a href="keywords.html" style="color:#767676;">
<i class="fa fa-angle-double-left" aria-hidden="true"></i>
Keywording and stabilization
</a>
</div>
<div class="col-sm-6">
<a href="maintainer.html" class="pull-right" style="color:#767676;">
Package Maintainers
<i class="fa fa-angle-double-right" aria-hidden="true"></i>
</a>
</div>
</div>
</div>
<div class="col-md-3 hidden-sm hidden-xs" role="main">
<div class="" role="navigation" aria-label="main navigation">
<div class="">
<nav class="bs-docs-sidebar" data-spy="affix" data-offset-top="140" data-offset-bottom="400">
<p class="hidden" role="heading"><span class="hidden-text">Contents:</span></p>
<ul class='current nav'>
<li class="toctree-l1"><a class="reference internal" href="preface.html">Preface</a></li>
<li class="toctree-l1"><a class="reference internal" href="motivation.html">Motivation and history</a></li>
<li class="toctree-l1"><a class="reference internal" href="basics.html">Basic information</a></li>
<li class="toctree-l1"><a class="reference internal" href="other-docs.html">Other policy documents</a></li>
<li class="toctree-l1"><a class="reference internal" href="dependencies.html">Dependencies</a></li>
<li class="toctree-l1"><a class="reference internal" href="deprecation.html">Deprecations</a></li>
<li class="toctree-l1"><a class="reference internal" href="ebuild-format.html">Ebuild file format</a></li>
<li class="toctree-l1"><a class="reference internal" href="filesystem.html">File system layout</a></li>
<li class="toctree-l1"><a class="reference internal" href="installed-files.html">Installed files</a></li>
<li class="toctree-l1"><a class="reference internal" href="keywords.html">Keywording and stabilization</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Language-specific policies</a><ul class='nav'>
<li class="toctree-l2"><a class="reference internal" href="#python">Python</a><ul class='nav'>
<li class="toctree-l3"><a class="reference internal" href="#pg0501">Eclass usage</a></li>
<li class="toctree-l3"><a class="reference internal" href="#pg0502">Python 2 deprecation</a></li>
</ul>
</li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="maintainer.html">Package Maintainers</a></li>
<li class="toctree-l1"><a class="reference internal" href="other-metadata.html">Other metadata variables</a></li>
<li class="toctree-l1"><a class="reference internal" href="use-flags.html">USE flags</a></li>
<li class="toctree-l1"><a class="reference internal" href="user-group.html">Users and groups</a></li>
</ul>
</nav>
</div>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="col-xs-12 col-md-offset-2 col-md-7">
<h3 class="footerhead">Gentoo Policy Guide </h3>
<div class="row">
<div class="col-xs-12 col-md-4">
<span class="kk-group-header">Powered by</span><br><span><a href="http://sphinx-doc.org/">Sphinx 4.1.2</a> & <a href="https://github.com/mmagorsc/tyrian_sphinx_theme">Tyrian Theme 0.0.7</a></span>
</div>
<div class="col-xs-12 col-md-4">
</div>
<div class="col-xs-12 col-md-4">
</div>
</div>
</div>
<div class="col-xs-12 col-md-3">
<h3 class="footerhead">Questions or comments?</h3>
Please feel free to <a href="https://www.gentoo.org/inside-gentoo/contact/">contact us</a>.
</div>
</div>
<div class="row">
<div class="col-xs-2 col-sm-3 col-md-2">
<ul class="footerlinks three-icons">
<li><a href="https://twitter.com/gentoo" title="@Gentoo on Twitter"><span class="fa fa-twitter fa-fw"></span></a></li>
<li><a href="https://plus.google.com/+Gentoo" title="+Gentoo on Google+"><span class="fa fa-google-plus fa-fw"></span></a></li>
<li><a href="https://www.facebook.com/gentoo.org" title="Gentoo on Facebook"><span class="fa fa-facebook fa-fw"></span></a></li>
</ul>
</div>
<div class="col-xs-10 col-sm-9 col-md-10">
<strong>© 2001–2020 Gentoo Foundation, Inc.</strong><br>
<small>
Gentoo is a trademark of the Gentoo Foundation, Inc.
The contents of this document, unless otherwise expressly stated, are licensed under the
<a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="license">CC-BY-SA-4.0</a> license.
The <a href="https://www.gentoo.org/inside-gentoo/foundation/name-logo-guidelines.html">Gentoo Name and Logo Usage Guidelines</a> apply.
</small>
</div>
</div>
</div>
</footer>
<script src="https://assets.gentoo.org/tyrian/bootstrap.min.js"></script>
<script type="text/javascript">
$('body').scrollspy({
target: '.bs-docs-sidebar',
offset: 40
});
</script>
<script type="text/javascript">
$('#indices-and-tables').hide()
</script>
</body>
</html>
|
GitWeb