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:mod:`modulefinder` --- Find modules used by a script
=====================================================

.. module:: modulefinder
   :synopsis: Find modules used by a script.
.. sectionauthor:: A.M. Kuchling <amk@amk.ca>

.. versionadded:: 2.3

**Source code:** :source:`Lib/modulefinder.py`

--------------

This module provides a :class:`ModuleFinder` class that can be used to determine
the set of modules imported by a script. ``modulefinder.py`` can also be run as
a script, giving the filename of a Python script as its argument, after which a
report of the imported modules will be printed.

.. function:: AddPackagePath(pkg_name, path)

Record that the package named *pkg_name* can be found in the specified *path*.

.. function:: ReplacePackage(oldname, newname)

Allows specifying that the module named *oldname* is in fact the package named
   *newname*.  The most common usage would be  to handle how the :mod:`_xmlplus`
   package replaces the :mod:`xml` package.

.. class:: ModuleFinder([path=None, debug=0, excludes=[], replace_paths=[]])

This class provides :meth:`run_script` and :meth:`report` methods to determine
   the set of modules imported by a script. *path* can be a list of directories to
   search for modules; if not specified, ``sys.path`` is used.  *debug* sets the
   debugging level; higher values make the class print  debugging messages about
   what it's doing. *excludes* is a list of module names to exclude from the
   analysis. *replace_paths* is a list of ``(oldpath, newpath)`` tuples that will
   be replaced in module paths.

.. method:: report()

Print a report to standard output that lists the modules imported by the
      script and their paths, as well as modules that are missing or seem to be
      missing.

.. method:: run_script(pathname)

Analyze the contents of the *pathname* file, which must contain Python
      code.

.. attribute:: modules

A dictionary mapping module names to modules. See
      :ref:`modulefinder-example`

.. _modulefinder-example:

Example usage of :class:`ModuleFinder`
--------------------------------------

The script that is going to get analyzed later on (bacon.py)::

import re, itertools

try:
       import baconhameggs
   except ImportError:
       pass

try:
       import guido.python.ham
   except ImportError:
       pass

The script that will output the report of bacon.py::

from modulefinder import ModuleFinder

finder = ModuleFinder()
   finder.run_script('bacon.py')

print 'Loaded modules:'
   for name, mod in finder.modules.iteritems():
       print '%s: ' % name,
       print ','.join(mod.globalnames.keys()[:3])

print '-'*50
   print 'Modules not imported:'
   print '\n'.join(finder.badmodules.iterkeys())

Sample output (may vary depending on the architecture)::

Loaded modules:
    _types:
    copy_reg:  _inverted_registry,_slotnames,__all__
    sre_compile:  isstring,_sre,_optimize_unicode
    _sre:
    sre_constants:  REPEAT_ONE,makedict,AT_END_LINE
    sys:
    re:  __module__,finditer,_expand
    itertools:
    __main__:  re,itertools,baconhameggs
    sre_parse:  __getslice__,_PATTERNENDERS,SRE_FLAG_UNICODE
    array:
    types:  __module__,IntType,TypeType
    ---------------------------------------------------
    Modules not imported:
    guido.python.ham
    baconhameggs