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<div class="section" id="module-dircache">
<h1>10.11. <tt class="xref docutils literal"><span class="pre">dircache</span></tt> — Cached directory listings<a class="headerlink" href="#module-dircache" title="Permalink to this headline">¶</a></h1>
<p class="deprecated">
<span class="versionmodified">Deprecated since version 2.6: </span>The <tt class="xref docutils literal"><span class="pre">dircache</span></tt> module has been removed in Python 3.0.</p>
<p>The <tt class="xref docutils literal"><span class="pre">dircache</span></tt> module defines a function for reading directory listing
using a cache, and cache invalidation using the <em>mtime</em> of the directory.
Additionally, it defines a function to annotate directories by appending a
slash.</p>
<p>The <tt class="xref docutils literal"><span class="pre">dircache</span></tt> module defines the following functions:</p>
<dl class="function">
<dt id="dircache.reset">
<tt class="descclassname">dircache.</tt><tt class="descname">reset</tt><big>(</big><big>)</big><a class="headerlink" href="#dircache.reset" title="Permalink to this definition">¶</a></dt>
<dd>Resets the directory cache.</dd></dl>
<dl class="function">
<dt id="dircache.listdir">
<tt class="descclassname">dircache.</tt><tt class="descname">listdir</tt><big>(</big><em>path</em><big>)</big><a class="headerlink" href="#dircache.listdir" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a directory listing of <em>path</em>, as gotten from <a title="os.listdir" class="reference external" href="os.html#os.listdir"><tt class="xref docutils literal"><span class="pre">os.listdir()</span></tt></a>. Note
that unless <em>path</em> changes, further call to <a title="dircache.listdir" class="reference internal" href="#dircache.listdir"><tt class="xref docutils literal"><span class="pre">listdir()</span></tt></a> will not re-read the
directory structure.</p>
<p>Note that the list returned should be regarded as read-only. (Perhaps a future
version should change it to return a tuple?)</p>
</dd></dl>
<dl class="function">
<dt id="dircache.opendir">
<tt class="descclassname">dircache.</tt><tt class="descname">opendir</tt><big>(</big><em>path</em><big>)</big><a class="headerlink" href="#dircache.opendir" title="Permalink to this definition">¶</a></dt>
<dd>Same as <a title="dircache.listdir" class="reference internal" href="#dircache.listdir"><tt class="xref docutils literal"><span class="pre">listdir()</span></tt></a>. Defined for backwards compatibility.</dd></dl>
<dl class="function">
<dt id="dircache.annotate">
<tt class="descclassname">dircache.</tt><tt class="descname">annotate</tt><big>(</big><em>head</em>, <em>list</em><big>)</big><a class="headerlink" href="#dircache.annotate" title="Permalink to this definition">¶</a></dt>
<dd>Assume <em>list</em> is a list of paths relative to <em>head</em>, and append, in place, a
<tt class="docutils literal"><span class="pre">'/'</span></tt> to each path which points to a directory.</dd></dl>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">dircache</span>
<span class="gp">>>> </span><span class="n">a</span> <span class="o">=</span> <span class="n">dircache</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="s">'/'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">a</span> <span class="o">=</span> <span class="n">a</span><span class="p">[:]</span> <span class="c"># Copy the return value so we can change 'a'</span>
<span class="gp">>>> </span><span class="n">a</span>
<span class="go">['bin', 'boot', 'cdrom', 'dev', 'etc', 'floppy', 'home', 'initrd', 'lib', 'lost+</span>
<span class="go">found', 'mnt', 'proc', 'root', 'sbin', 'tmp', 'usr', 'var', 'vmlinuz']</span>
<span class="gp">>>> </span><span class="n">dircache</span><span class="o">.</span><span class="n">annotate</span><span class="p">(</span><span class="s">'/'</span><span class="p">,</span> <span class="n">a</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">a</span>
<span class="go">['bin/', 'boot/', 'cdrom/', 'dev/', 'etc/', 'floppy/', 'home/', 'initrd/', 'lib/</span>
<span class="go">', 'lost+found/', 'mnt/', 'proc/', 'root/', 'sbin/', 'tmp/', 'usr/', 'var/', 'vm</span>
<span class="go">linuz']</span>
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