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<h3>Module Loading and Compilation</h3>
<p>So far, this chapter has presented modules as files containing Python code. However, modules loaded with <tT CLAss="monofont">import</tt> really fall into four general categories:</P>
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<p>Programs written in Python (<tt CLASs="monofont">.py</tt> files)</p>
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<p>C or C++ extensions that have been compiled into shared libraries or DLLs</p>
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<p>Packages containing a collection of modules</p>
</li>
<li>
<P>Built-in modules written in C and linked into the Python interpreter</p>
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</ul>
<p>When looking for a module <Tt claSs="monofont">foo</tt>, the interpreter searches each of the directories in <TT CLass="monofont">sys.path</tT> for the following files (listed in search order):</P>
<OL type="1">
<LI>
<P> A directory <Tt claSS="monofont">foo</TT> defining a package</p>
</li>
<li>
<p> <tt class="monofont">foo.so</tt>, <tt claSs="monofont">foomodule.so</tT>, <tt cLass="monofont">foomodule.sl</tT>, or <tt cLASS="monofont">foomodule.dll</tt> (compiled extensions)</p>
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<P> <tt clASS="monofont">foo.pyo</Tt> (only if the <tt cLASS="monofont">-O</tt> or <tt class="monofont">-OO</tt> option has been used)</p>
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<p> <tt cLasS="monofont">foo.pyc</tt></p>
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<p> <Tt clASS="monofont">foo.py</Tt></p>
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</OL>
<P>Packages are described shortly; compiled extensions are described in <A href="121.html">Appendix B</A>, 揈xtending and Embedding Python.⌨️ 快捷键说明
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