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<title>7.3 Single extension module</title>
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<H1><A NAME="SECTION007300000000000000000"></A>
<A NAME="single-ext"></A>
<BR>
7.3 Single extension module
</H1>

<P>
Extension modules are specified using the <span class="du-option">ext_modules</span> option.
<span class="du-option">package_dir</span> 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:
<div class="verbatim"><pre>
&lt;root&gt;/
        setup.py
        foo.c
</pre></div>
If the <tt class="module">foo</tt> extension belongs in the root package, the setup
script for this could be
<div class="verbatim"><pre>
from distutils.core import setup
setup(name='foobar',
      version='1.0',
      ext_modules=[Extension('foo', ['foo.c'])],
      )
</pre></div>

<P>
If the extension actually belongs in a package, say <tt class="module">foopkg</tt>,
then

<P>
With exactly the same source tree layout, this extension can be put in
the <tt class="module">foopkg</tt> package simply by changing the name of the
extension:
<div class="verbatim"><pre>
from distutils.core import setup
setup(name='foobar',
      version='1.0',
      ext_modules=[Extension('foopkg.foo', ['foo.c'])],
      )
</pre></div>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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