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+
+:mod:`pkgutil` --- Package extension utility
+============================================
+
+.. module:: pkgutil
+   :synopsis: Utilities to support extension of packages.
+
+
+.. versionadded:: 2.3
+
+This module provides functions to manipulate packages:
+
+
+.. function:: extend_path(path, name)
+
+   Extend the search path for the modules which comprise a package. Intended use is
+   to place the following code in a package's :file:`__init__.py`::
+
+      from pkgutil import extend_path
+      __path__ = extend_path(__path__, __name__)
+
+   This will add to the package's ``__path__`` all subdirectories of directories on
+   ``sys.path`` named after the package.  This is useful if one wants to distribute
+   different parts of a single logical package as multiple directories.
+
+   It also looks for :file:`\*.pkg` files beginning where ``*`` matches the *name*
+   argument.  This feature is similar to :file:`\*.pth` files (see the :mod:`site`
+   module for more information), except that it doesn't special-case lines starting
+   with ``import``.  A :file:`\*.pkg` file is trusted at face value: apart from
+   checking for duplicates, all entries found in a :file:`\*.pkg` file are added to
+   the path, regardless of whether they exist on the filesystem.  (This is a
+   feature.)
+
+   If the input path is not a list (as is the case for frozen packages) it is
+   returned unchanged.  The input path is not modified; an extended copy is
+   returned.  Items are only appended to the copy at the end.
+
+   It is assumed that ``sys.path`` is a sequence.  Items of ``sys.path`` that are
+   not (Unicode or 8-bit) strings referring to existing directories are ignored.
+   Unicode items on ``sys.path`` that cause errors when used as filenames may cause
+   this function to raise an exception (in line with :func:`os.path.isdir`
+   behavior).
+
+.. function:: get_data(package, resource)
+
+   Get a resource from a package.
+
+   This is a wrapper for the PEP 302 loader :func:`get_data` API. The package
+   argument should be the name of a package, in standard module format
+   (foo.bar). The resource argument should be in the form of a relative
+   filename, using ``/`` as the path separator. The parent directory name
+   ``..`` is not allowed, and nor is a rooted name (starting with a ``/``).
+
+   The function returns a binary string that is the contents of the
+   specified resource.
+
+   For packages located in the filesystem, which have already been imported,
+   this is the rough equivalent of::
+
+       d = os.path.dirname(sys.modules[package].__file__)
+       data = open(os.path.join(d, resource), 'rb').read()
+
+   If the package cannot be located or loaded, or it uses a PEP 302 loader
+   which does not support :func:`get_data`, then None is returned.