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\section{\module{pkgutil} ---
Package extension utility}
\declaremodule{standard}{pkgutil}
\modulesynopsis{Utilities to support extension of packages.}
\versionadded{2.3}
This module provides a single function:
\begin{funcdesc}{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}:
\begin{verbatim}
from pkgutil import extend_path
__path__ = extend_path(__path__, __name__)
\end{verbatim}
This will add to the package's \code{__path__} all subdirectories of
directories on \code{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 \code{*}
matches the \var{name} argument. This feature is similar to
\file{*.pth} files (see the \refmodule{site} module for more
information), except that it doesn't special-case lines starting
with \code{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 \code{sys.path} is a sequence. Items of
\code{sys.path} that are not (Unicode or 8-bit) strings referring to
existing directories are ignored. Unicode items on \code{sys.path}
that cause errors when used as filenames may cause this function to
raise an exception (in line with \function{os.path.isdir()} behavior).
\end{funcdesc}
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