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  <div class="section" id="examples">
<span id="id1"></span><h1>7. Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h1>
<p>This chapter provides a number of basic examples to help get started with
distutils.  Additional information about using distutils can be found in the
Distutils Cookbook.</p>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt><a class="reference external" href="http://wiki.python.org/moin/Distutils/Cookbook">Distutils Cookbook</a></dt>
<dd>Collection of recipes showing how to achieve more control over distutils.</dd>
</dl>
</div>
<div class="section" id="pure-python-distribution-by-module">
<span id="pure-mod"></span><h2>7.1. Pure Python distribution (by module)<a class="headerlink" href="#pure-python-distribution-by-module" title="Permalink to this headline">¶</a></h2>
<p>If you&#8217;re just distributing a couple of modules, especially if they don&#8217;t live
in a particular package, you can specify them individually using the
<em class="xref std std-option">py_modules</em> option in the setup script.</p>
<p>In the simplest case, you&#8217;ll have two files to worry about: a setup script and
the single module you&#8217;re distributing, <tt class="file docutils literal"><span class="pre">foo.py</span></tt> in this example:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        foo.py</pre>
</div>
<p>(In all diagrams in this section, <em>&lt;root&gt;</em> will refer to the distribution root
directory.)  A minimal setup script to describe this situation would be:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foo&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">py_modules</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foo&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>Note that the name of the distribution is specified independently with the
<em class="xref std std-option">name</em> option, and there&#8217;s no rule that says it has to be the same as
the name of the sole module in the distribution (although that&#8217;s probably a good
convention to follow).  However, the distribution name is used to generate
filenames, so you should stick to letters, digits, underscores, and hyphens.</p>
<p>Since <em class="xref std std-option">py_modules</em> is a list, you can of course specify multiple
modules, eg. if you&#8217;re distributing modules <tt class="xref py py-mod docutils literal"><span class="pre">foo</span></tt> and <tt class="xref py py-mod docutils literal"><span class="pre">bar</span></tt>, your
setup might look like this:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        foo.py
        bar.py</pre>
</div>
<p>and the setup script might be</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">py_modules</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="s">&#39;bar&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>You can put module source files into another directory, but if you have enough
modules to do that, it&#8217;s probably easier to specify modules by package rather
than listing them individually.</p>
</div>
<div class="section" id="pure-python-distribution-by-package">
<span id="pure-pkg"></span><h2>7.2. Pure Python distribution (by package)<a class="headerlink" href="#pure-python-distribution-by-package" title="Permalink to this headline">¶</a></h2>
<p>If you have more than a couple of modules to distribute, especially if they are
in multiple packages, it&#8217;s probably easier to specify whole packages rather than
individual modules.  This works even if your modules are not in a package; you
can just tell the Distutils to process modules from the root package, and that
works the same as any other package (except that you don&#8217;t have to have an
<tt class="file docutils literal"><span class="pre">__init__.py</span></tt> file).</p>
<p>The setup script from the last example could also be written as</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>(The empty string stands for the root package.)</p>
<p>If those two files are moved into a subdirectory, but remain in the root
package, e.g.:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        src/      foo.py
                  bar.py</pre>
</div>
<p>then you would still specify the root package, but you have to tell the
Distutils where source files in the root package live:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">package_dir</span><span class="o">=</span><span class="p">{</span><span class="s">&#39;&#39;</span><span class="p">:</span> <span class="s">&#39;src&#39;</span><span class="p">},</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>More typically, though, you will want to distribute multiple modules in the same
package (or in sub-packages).  For example, if the <tt class="xref py py-mod docutils literal"><span class="pre">foo</span></tt>  and <tt class="xref py py-mod docutils literal"><span class="pre">bar</span></tt>
modules belong in package <tt class="xref py py-mod docutils literal"><span class="pre">foobar</span></tt>, one way to layout your source tree is</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        foobar/
                 __init__.py
                 foo.py
                 bar.py</pre>
</div>
<p>This is in fact the default layout expected by the Distutils, and the one that
requires the least work to describe in your setup script:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foobar&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>If you want to put modules in directories not named for their package, then you
need to use the <em class="xref std std-option">package_dir</em> option again.  For example, if the
<tt class="file docutils literal"><span class="pre">src</span></tt> directory holds modules in the <tt class="xref py py-mod docutils literal"><span class="pre">foobar</span></tt> package:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        src/
                 __init__.py
                 foo.py
                 bar.py</pre>
</div>
<p>an appropriate setup script would be</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">package_dir</span><span class="o">=</span><span class="p">{</span><span class="s">&#39;foobar&#39;</span><span class="p">:</span> <span class="s">&#39;src&#39;</span><span class="p">},</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foobar&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>Or, you might put modules from your main package right in the distribution
root:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        __init__.py
        foo.py
        bar.py</pre>
</div>
<p>in which case your setup script would be</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">package_dir</span><span class="o">=</span><span class="p">{</span><span class="s">&#39;foobar&#39;</span><span class="p">:</span> <span class="s">&#39;&#39;</span><span class="p">},</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foobar&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>(The empty string also stands for the current directory.)</p>
<p>If you have sub-packages, they must be explicitly listed in <em class="xref std std-option">packages</em>,
but any entries in <em class="xref std std-option">package_dir</em> automatically extend to sub-packages.
(In other words, the Distutils does <em>not</em> scan your source tree, trying to
figure out which directories correspond to Python packages by looking for
<tt class="file docutils literal"><span class="pre">__init__.py</span></tt> files.)  Thus, if the default layout grows a sub-package:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        foobar/
                 __init__.py
                 foo.py
                 bar.py
                 subfoo/
                           __init__.py
                           blah.py</pre>
</div>
<p>then the corresponding setup script would be</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">packages</span><span class="o">=</span><span class="p">[</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span> <span class="s">&#39;foobar.subfoo&#39;</span><span class="p">],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>(Again, the empty string in <em class="xref std std-option">package_dir</em> stands for the current
directory.)</p>
</div>
<div class="section" id="single-extension-module">
<span id="single-ext"></span><h2>7.3. Single extension module<a class="headerlink" href="#single-extension-module" title="Permalink to this headline">¶</a></h2>
<p>Extension modules are specified using the <em class="xref std std-option">ext_modules</em> option.
<em class="xref std std-option">package_dir</em> has no effect on where extension source files are found;
it only affects the source for pure Python modules.  The simplest  case, a
single extension module in a single C source file, is:</p>
<div class="highlight-python"><pre>&lt;root&gt;/
        setup.py
        foo.c</pre>
</div>
<p>If the <tt class="xref py py-mod docutils literal"><span class="pre">foo</span></tt> extension belongs in the root package, the setup script for
this could be</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="kn">from</span> <span class="nn">distutils.extension</span> <span class="kn">import</span> <span class="n">Extension</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">ext_modules</span><span class="o">=</span><span class="p">[</span><span class="n">Extension</span><span class="p">(</span><span class="s">&#39;foo&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">&#39;foo.c&#39;</span><span class="p">])],</span>
      <span class="p">)</span>
</pre></div>
</div>
<p>If the extension actually belongs in a package, say <tt class="xref py py-mod docutils literal"><span class="pre">foopkg</span></tt>, then</p>
<p>With exactly the same source tree layout, this extension can be put in the
<tt class="xref py py-mod docutils literal"><span class="pre">foopkg</span></tt> package simply by changing the name of the extension:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">distutils.core</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="kn">from</span> <span class="nn">distutils.extension</span> <span class="kn">import</span> <span class="n">Extension</span>
<span class="n">setup</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&#39;foobar&#39;</span><span class="p">,</span>
      <span class="n">version</span><span class="o">=</span><span class="s">&#39;1.0&#39;</span><span class="p">,</span>
      <span class="n">ext_modules</span><span class="o">=</span><span class="p">[</span><span class="n">Extension</span><span class="p">(</span><span class="s">&#39;foopkg.foo&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s">&#39;foo.c&#39;</span><span class="p">])],</span>
      <span class="p">)</span>
</pre></div>
</div>
</div>
</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">7. Examples</a><ul>
<li><a class="reference internal" href="#pure-python-distribution-by-module">7.1. Pure Python distribution (by module)</a></li>
<li><a class="reference internal" href="#pure-python-distribution-by-package">7.2. Pure Python distribution (by package)</a></li>
<li><a class="reference internal" href="#single-extension-module">7.3. Single extension module</a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
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                        title="previous chapter">6. The Python Package Index (PyPI)</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="extending.html"
                        title="next chapter">8. Extending Distutils</a></p>
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