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v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
pkgutil.rst
: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.