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+
+:mod:`linecache` --- Random access to text lines
+================================================
+
+.. module:: linecache
+   :synopsis: This module provides random access to individual lines from text files.
+.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
+
+
+The :mod:`linecache` 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 :mod:`traceback` module
+to retrieve source lines for inclusion in  the formatted traceback.
+
+The :mod:`linecache` module defines the following functions:
+
+
+.. function:: getline(filename, lineno[, module_globals])
+
+   Get line *lineno* from file named *filename*. This function will never throw an
+   exception --- it will return ``''`` on errors (the terminating newline character
+   will be included for lines that are found).
+
+   .. index:: triple: module; search; path
+
+   If a file named *filename* is not found, the function will look for it in the
+   module search path, ``sys.path``, after first checking for a :pep:`302`
+   ``__loader__`` in *module_globals*, in case the module was imported from a
+   zipfile or other non-filesystem import source.
+
+   .. versionadded:: 2.5
+      The *module_globals* parameter was added.
+
+
+.. function:: clearcache()
+
+   Clear the cache.  Use this function if you no longer need lines from files
+   previously read using :func:`getline`.
+
+
+.. function:: checkcache([filename])
+
+   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 *filename* is omitted,
+   it will check all the entries in the cache.
+
+Example::
+
+   >>> import linecache
+   >>> linecache.getline('/etc/passwd', 4)
+   'sys:x:3:3:sys:/dev:/bin/sh\n'
+