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  &lt;div class=&quot;section&quot; id=&quot;module-linecache&quot;&gt;
&lt;span id=&quot;linecache-random-access-to-text-lines&quot;&gt;&lt;/span&gt;&lt;h1&gt;10.9. &lt;a class=&quot;reference internal&quot; href=&quot;#module-linecache&quot; title=&quot;linecache: This module provides random access to individual lines from text files.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;linecache&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; &amp;#8212; Random access to text lines&lt;a class=&quot;headerlink&quot; href=&quot;#module-linecache&quot; title=&quot;Permalink to this headline&quot;&gt;¶&lt;/a&gt;&lt;/h1&gt;
&lt;p&gt;&lt;strong&gt;Source code:&lt;/strong&gt; &lt;a class=&quot;reference external&quot; href=&quot;http://hg.python.org/cpython/file/2.7/Lib/linecache.py&quot;&gt;Lib/linecache.py&lt;/a&gt;&lt;/p&gt;
&lt;hr class=&quot;docutils&quot; /&gt;
&lt;p&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-linecache&quot; title=&quot;linecache: This module provides random access to individual lines from text files.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;linecache&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; 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 &lt;a class=&quot;reference internal&quot; href=&quot;traceback.html#module-traceback&quot; title=&quot;traceback: Print or retrieve a stack traceback.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;traceback&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module
to retrieve source lines for inclusion in  the formatted traceback.&lt;/p&gt;
&lt;p&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-linecache&quot; title=&quot;linecache: This module provides random access to individual lines from text files.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;linecache&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module defines the following functions:&lt;/p&gt;
&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;linecache.getline&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;linecache.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;getline&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;em&gt;filename&lt;/em&gt;, &lt;em&gt;lineno&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;[&lt;/span&gt;, &lt;em&gt;module_globals&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;]&lt;/span&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#linecache.getline&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Get line &lt;em&gt;lineno&lt;/em&gt; from file named &lt;em&gt;filename&lt;/em&gt;. This function will never raise an
exception &amp;#8212; it will return &lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;''&lt;/span&gt;&lt;/tt&gt; on errors (the terminating newline character
will be included for lines that are found).&lt;/p&gt;
&lt;p id=&quot;index-0&quot;&gt;If a file named &lt;em&gt;filename&lt;/em&gt; is not found, the function will look for it in the
module search path, &lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;sys.path&lt;/span&gt;&lt;/tt&gt;, after first checking for a &lt;span class=&quot;target&quot; id=&quot;index-1&quot;&gt;&lt;/span&gt;&lt;a class=&quot;pep reference external&quot; href=&quot;http://www.python.org/dev/peps/pep-0302&quot;&gt;&lt;strong&gt;PEP 302&lt;/strong&gt;&lt;/a&gt;
&lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;__loader__&lt;/span&gt;&lt;/tt&gt; in &lt;em&gt;module_globals&lt;/em&gt;, in case the module was imported from a
zipfile or other non-filesystem import source.&lt;/p&gt;
&lt;p class=&quot;versionadded&quot;&gt;
&lt;span class=&quot;versionmodified&quot;&gt;New in version 2.5: &lt;/span&gt;The &lt;em&gt;module_globals&lt;/em&gt; parameter was added.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;linecache.clearcache&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;linecache.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;clearcache&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#linecache.clearcache&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Clear the cache.  Use this function if you no longer need lines from files
previously read using &lt;a class=&quot;reference internal&quot; href=&quot;#linecache.getline&quot; title=&quot;linecache.getline&quot;&gt;&lt;tt class=&quot;xref py py-func docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;getline()&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt;.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;linecache.checkcache&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;linecache.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;checkcache&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;span class=&quot;optional&quot;&gt;[&lt;/span&gt;&lt;em&gt;filename&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;]&lt;/span&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#linecache.checkcache&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;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 &lt;em&gt;filename&lt;/em&gt; is omitted,
it will check all the entries in the cache.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;p&gt;Example:&lt;/p&gt;
&lt;div class=&quot;highlight-python&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre&gt;&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;kn&quot;&gt;import&lt;/span&gt; &lt;span class=&quot;nn&quot;&gt;linecache&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;n&quot;&gt;linecache&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;getline&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;s&quot;&gt;&amp;#39;/etc/passwd&amp;#39;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;mi&quot;&gt;4&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;go&quot;&gt;&amp;#39;sys:x:3:3:sys:/dev:/bin/sh\n&amp;#39;&lt;/span&gt;
&lt;/pre&gt;&lt;/div&gt;
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