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  <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> &#8211; 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>&#8216;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&#8217;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&#8217;t get
released soon we&#8217;ll look at making this function check that the
version tuple makes sense before transforming it into a string.</p>
</div>
<p>It&#8217;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">&lt;</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">&gt;=</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">&#39;kitchen is present but not at the right version.&#39;</span>
    <span class="k">print</span> <span class="s">&#39;We need at least version 0.2.1 and less than 0.3.0&#39;</span>
    <span class="k">print</span> <span class="s">&#39;Currently found: kitchen-</span><span class="si">%s</span><span class="s">&#39;</span> <span class="o">%</span> <span class="n">__version__</span>
</pre></div>
</div>
</dd></dl>

</div>
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