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<H1><A NAME="SECTION0019900000000000000000">
17.9 <tt class="module">compileall</tt> --
Byte-compile Python libraries</A>
</H1>
<P>
<P>
This module provides some utility functions to support installing
Python libraries. These functions compile Python source files in a
directory tree, allowing users without permission to write to the
libraries to take advantage of cached byte-code files.
<P>
The source file for this module may also be used as a script to
compile Python sources in directories named on the command line or in
<code>sys.path</code>.
<P>
<dl><dt><b><a name='l2h-3062'><tt class='function'>compile_dir</tt></a></b> (<var>dir</var><big>[</big><var>, maxlevels</var><big>[</big><var>,
ddir</var><big>[</big><var>, force</var><big>]</big><big>]</big><big>]</big>)
<dd>
Recursively descend the directory tree named by <var>dir</var>, compiling
all <span class="file">.py</span> files along the way. The <var>maxlevels</var> parameter
is used to limit the depth of the recursion; it defaults to
<code>10</code>. If <var>ddir</var> is given, it is used as the base path from
which the filenames used in error messages will be generated. If
<var>force</var> is true, modules are re-compiled even if the timestamps
are up to date.
</dl>
<P>
<dl><dt><b><a name='l2h-3063'><tt class='function'>compile_path</tt></a></b> (<big>[</big><var>skip_curdir</var><big>[</big><var>,
maxlevels</var><big>[</big><var>, force</var><big>]</big><big>]</big><big>]</big>)
<dd>
Byte-compile all the <span class="file">.py</span> files found along <code>sys.path</code>.
If <var>skip_curdir</var> is true (the default), the current directory is
not included in the search. The <var>maxlevels</var> and
<var>force</var> parameters default to <code>0</code> and are passed to the
<tt class="function">compile_dir()</tt> function.
</dl>
<P>
<div class='seealso'>
<p class='heading'><b>See Also:</b></p>
<dl compact class="seemodule">
<dt>Module <b><tt class='module'><a href="module-pycompile.html" tppabs="http://www.python.org/doc/current/lib/module-pycompile.html">py_compile</a></tt>:</b>
<dd>Byte-compile a single source file.
</dl>
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