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<h1>10.9. <tt class="xref docutils literal"><span class="pre">linecache</span></tt> — Random access to text lines<a class="headerlink" href="#module-linecache" title="Permalink to this headline">¶</a></h1>
<p>The <tt class="xref docutils literal"><span class="pre">linecache</span></tt> module allows one to get any line from any file, while
attempting to optimize internally, using a cache, the common case where many
lines are read from a single file. This is used by the <a title="Print or retrieve a stack traceback." class="reference external" href="traceback.html#module-traceback"><tt class="xref docutils literal"><span class="pre">traceback</span></tt></a> module
to retrieve source lines for inclusion in the formatted traceback.</p>
<p>The <tt class="xref docutils literal"><span class="pre">linecache</span></tt> module defines the following functions:</p>
<dl class="function">
<dt id="linecache.getline">
<tt class="descclassname">linecache.</tt><tt class="descname">getline</tt><big>(</big><em>filename</em>, <em>lineno</em><span class="optional">[</span>, <em>module_globals</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#linecache.getline" title="Permalink to this definition">¶</a></dt>
<dd><p>Get line <em>lineno</em> from file named <em>filename</em>. This function will never throw an
exception — it will return <tt class="docutils literal"><span class="pre">''</span></tt> on errors (the terminating newline character
will be included for lines that are found).</p>
<p id="index-411">If a file named <em>filename</em> is not found, the function will look for it in the
module search path, <tt class="docutils literal"><span class="pre">sys.path</span></tt>, after first checking for a <span class="target" id="index-412"></span><a class="reference external" href="http://www.python.org/dev/peps/pep-0302"><strong>PEP 302</strong></a>
<tt class="docutils literal"><span class="pre">__loader__</span></tt> in <em>module_globals</em>, in case the module was imported from a
zipfile or other non-filesystem import source.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.5: </span>The <em>module_globals</em> parameter was added.</p>
</dd></dl>
<dl class="function">
<dt id="linecache.clearcache">
<tt class="descclassname">linecache.</tt><tt class="descname">clearcache</tt><big>(</big><big>)</big><a class="headerlink" href="#linecache.clearcache" title="Permalink to this definition">¶</a></dt>
<dd>Clear the cache. Use this function if you no longer need lines from files
previously read using <a title="linecache.getline" class="reference internal" href="#linecache.getline"><tt class="xref docutils literal"><span class="pre">getline()</span></tt></a>.</dd></dl>
<dl class="function">
<dt id="linecache.checkcache">
<tt class="descclassname">linecache.</tt><tt class="descname">checkcache</tt><big>(</big><span class="optional">[</span><em>filename</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#linecache.checkcache" title="Permalink to this definition">¶</a></dt>
<dd>Check the cache for validity. Use this function if files in the cache may have
changed on disk, and you require the updated version. If <em>filename</em> is omitted,
it will check all the entries in the cache.</dd></dl>
<p>Example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">linecache</span>
<span class="gp">>>> </span><span class="n">linecache</span><span class="o">.</span><span class="n">getline</span><span class="p">(</span><span class="s">'/etc/passwd'</span><span class="p">,</span> <span class="mi">4</span><span class="p">)</span>
<span class="go">'sys:x:3:3:sys:/dev:/bin/sh\n'</span>
</pre></div>
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