Edit File: api-versioning.html
<!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>Helpers for versioning software — kitchen 1.1.1 documentation</title> <link rel="stylesheet" href="_static/default.css" type="text/css" /> <link rel="stylesheet" href="_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '', VERSION: '1.1.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="_static/jquery.js"></script> <script type="text/javascript" src="_static/underscore.js"></script> <script type="text/javascript" src="_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within kitchen 1.1.1 documentation" href="_static/opensearch.xml"/> <link rel="top" title="kitchen 1.1.1 documentation" href="index.html" /> <link rel="up" title="Kitchen API" href="api-overview.html" /> <link rel="next" title="Python 2.4 Compatibiity" href="api-pycompat24.html" /> <link rel="prev" title="Kitchen.iterutils Module" href="api-iterutils.html" /> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="api-pycompat24.html" title="Python 2.4 Compatibiity" accesskey="N">next</a> |</li> <li class="right" > <a href="api-iterutils.html" title="Kitchen.iterutils Module" accesskey="P">previous</a> |</li> <li><a href="index.html">kitchen 1.1.1 documentation</a> »</li> <li><a href="api-overview.html" accesskey="U">Kitchen API</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-kitchen.versioning"> <span id="helpers-for-versioning-software"></span><h1>Helpers for versioning software<a class="headerlink" href="#module-kitchen.versioning" title="Permalink to this headline">¶</a></h1> <div class="section" id="pep-386-compliant-versioning"> <h2>PEP-386 compliant versioning<a class="headerlink" href="#pep-386-compliant-versioning" title="Permalink to this headline">¶</a></h2> <p><span class="target" id="index-0"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> defines a standard format for version strings. This module contains a function for creating strings in that format.</p> <dl class="function"> <dt id="kitchen.versioning.version_tuple_to_string"> <tt class="descclassname">kitchen.versioning.</tt><tt class="descname">version_tuple_to_string</tt><big>(</big><em>version_info</em><big>)</big><a class="headerlink" href="#kitchen.versioning.version_tuple_to_string" title="Permalink to this definition">¶</a></dt> <dd><p>Return a <span class="target" id="index-1"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> version string from a <span class="target" id="index-2"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> style version tuple</p> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>version_info</strong> – Nested set of tuples that describes the version. See below for an example.</td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a version string</td> </tr> </tbody> </table> <p>This function implements just enough of <span class="target" id="index-3"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> to satisfy our needs. <span class="target" id="index-4"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> defines a standard format for version strings and refers to a function that will be merged into the <a class="reference external" href="http://docs.python.org/library">python standard library</a> that transforms a tuple of version information into a standard version string. This function is an implementation of that function. Once that function becomes available in the <a class="reference external" href="http://docs.python.org/library">python standard library</a> we will start using it and deprecate this function.</p> <p><tt class="xref py py-attr docutils literal"><span class="pre">version_info</span></tt> takes the form that <span class="target" id="index-5"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a>‘s <tt class="xref py py-func docutils literal"><span class="pre">NormalizedVersion.from_parts()</span></tt> uses:</p> <div class="highlight-python"><pre>((Major, Minor, [Micros]), [(Alpha/Beta/rc marker, version)], [(post/dev marker, version)]) Ex: ((1, 0, 0), ('a', 2), ('dev', 3456))</pre> </div> <p>It generates a <span class="target" id="index-6"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> compliant version string:</p> <div class="highlight-python"><pre>N.N[.N]+[{a|b|c|rc}N[.N]+][.postN][.devN] Ex: 1.0.0a2.dev3456</pre> </div> <div class="admonition warning"> <p class="first admonition-title">Warning</p> <p class="last">This function does next to no error checking. It’s up to the person defining the version tuple to make sure that the values make sense. If the <span class="target" id="index-7"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0386"><strong>PEP 386</strong></a> compliant version parser doesn’t get released soon we’ll look at making this function check that the version tuple makes sense before transforming it into a string.</p> </div> <p>It’s recommended that you use this function to keep a <tt class="xref py py-data docutils literal"><span class="pre">__version_info__</span></tt> tuple and <tt class="xref py py-data docutils literal"><span class="pre">__version__</span></tt> string in your modules. Why do we need both a tuple and a string? The string is often useful for putting into human readable locations like release announcements, version strings in tarballs, etc. Meanwhile the tuple is very easy for a computer to compare. For example, kitchen sets up its version information like this:</p> <div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">kitchen.versioning</span> <span class="kn">import</span> <span class="n">version_tuple_to_string</span> <span class="n">__version_info__</span> <span class="o">=</span> <span class="p">((</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">),)</span> <span class="n">__version__</span> <span class="o">=</span> <span class="n">version_tuple_to_string</span><span class="p">(</span><span class="n">__version_info__</span><span class="p">)</span> </pre></div> </div> <p>Other programs that depend on a kitchen version between 0.2.1 and 0.3.0 can find whether the present version is okay with code like this:</p> <div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">kitchen</span> <span class="kn">import</span> <span class="n">__version_info__</span><span class="p">,</span> <span class="n">__version__</span> <span class="k">if</span> <span class="n">__version_info__</span> <span class="o"><</span> <span class="p">((</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">),)</span> <span class="ow">or</span> <span class="n">__version_info__</span> <span class="o">>=</span> <span class="p">((</span><span class="mi">0</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">0</span><span class="p">),):</span> <span class="k">print</span> <span class="s">'kitchen is present but not at the right version.'</span> <span class="k">print</span> <span class="s">'We need at least version 0.2.1 and less than 0.3.0'</span> <span class="k">print</span> <span class="s">'Currently found: kitchen-</span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">__version__</span> </pre></div> </div> </dd></dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="index.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Helpers for versioning software</a><ul> <li><a class="reference internal" href="#pep-386-compliant-versioning">PEP-386 compliant versioning</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="api-iterutils.html" title="previous chapter">Kitchen.iterutils Module</a></p> <h4>Next topic</h4> <p class="topless"><a href="api-pycompat24.html" title="next chapter">Python 2.4 Compatibiity</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="_sources/api-versioning.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="api-pycompat24.html" title="Python 2.4 Compatibiity" >next</a> |</li> <li class="right" > <a href="api-iterutils.html" title="Kitchen.iterutils Module" >previous</a> |</li> <li><a href="index.html">kitchen 1.1.1 documentation</a> »</li> <li><a href="api-overview.html" >Kitchen API</a> »</li> </ul> </div> <div class="footer"> © Copyright 2011 Red Hat, Inc. and others. Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>