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+
+:mod:`pkgutil` --- Package extension utility
+============================================
+
+.. module:: pkgutil
+ :synopsis: Utilities to support extension of packages.
+
+
+.. versionadded:: 2.3
+
+This module provides a single function:
+
+
+.. 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).
+