cpython/Doc/library/zipimport.rst

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:mod:`zipimport` --- Import modules from Zip archives
=====================================================
.. module:: zipimport
:synopsis: support for importing Python modules from ZIP archives.
.. moduleauthor:: Just van Rossum <just@letterror.com>
.. versionadded:: 2.3
This module adds the ability to import Python modules (:file:`\*.py`,
:file:`\*.py[co]`) and packages from ZIP-format archives. It is usually not
needed to use the :mod:`zipimport` module explicitly; it is automatically used
by the built-in :keyword:`import` mechanism for ``sys.path`` items that are paths
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to ZIP archives.
Typically, ``sys.path`` is a list of directory names as strings. This module
also allows an item of ``sys.path`` to be a string naming a ZIP file archive.
The ZIP archive can contain a subdirectory structure to support package imports,
and a path within the archive can be specified to only import from a
subdirectory. For example, the path :file:`/tmp/example.zip/lib/` would only
import from the :file:`lib/` subdirectory within the archive.
Any files may be present in the ZIP archive, but only files :file:`.py` and
:file:`.py[co]` are available for import. ZIP import of dynamic modules
(:file:`.pyd`, :file:`.so`) is disallowed. Note that if an archive only contains
:file:`.py` files, Python will not attempt to modify the archive by adding the
corresponding :file:`.pyc` or :file:`.pyo` file, meaning that if a ZIP archive
doesn't contain :file:`.pyc` files, importing may be rather slow.
Using the built-in :func:`reload` function will fail if called on a module
loaded from a ZIP archive; it is unlikely that :func:`reload` would be needed,
since this would imply that the ZIP has been altered during runtime.
.. seealso::
`PKZIP Application Note <http://www.pkware.com/documents/casestudies/APPNOTE.TXT>`_
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Documentation on the ZIP file format by Phil Katz, the creator of the format and
algorithms used.
:pep:`0273` - Import Modules from Zip Archives
Written by James C. Ahlstrom, who also provided an implementation. Python 2.3
follows the specification in PEP 273, but uses an implementation written by Just
van Rossum that uses the import hooks described in PEP 302.
:pep:`0302` - New Import Hooks
The PEP to add the import hooks that help this module work.
This module defines an exception:
.. exception:: ZipImportError
Exception raised by zipimporter objects. It's a subclass of :exc:`ImportError`,
so it can be caught as :exc:`ImportError`, too.
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.. _zipimporter-objects:
zipimporter Objects
-------------------
:class:`zipimporter` is the class for importing ZIP files.
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.. class:: zipimporter(archivepath)
Create a new zipimporter instance. *archivepath* must be a path to a ZIP
file, or to a specific path within a ZIP file. For example, an *archivepath*
of :file:`foo/bar.zip/lib` will look for modules in the :file:`lib` directory
inside the ZIP file :file:`foo/bar.zip` (provided that it exists).
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:exc:`ZipImportError` is raised if *archivepath* doesn't point to a valid ZIP
archive.
.. method:: find_module(fullname[, path])
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Search for a module specified by *fullname*. *fullname* must be the fully
qualified (dotted) module name. It returns the zipimporter instance itself
if the module was found, or :const:`None` if it wasn't. The optional
*path* argument is ignored---it's there for compatibility with the
importer protocol.
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.. method:: get_code(fullname)
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Return the code object for the specified module. Raise
:exc:`ZipImportError` if the module couldn't be found.
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.. method:: get_data(pathname)
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Return the data associated with *pathname*. Raise :exc:`IOError` if the
file wasn't found.
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.. method:: get_source(fullname)
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Return the source code for the specified module. Raise
:exc:`ZipImportError` if the module couldn't be found, return
:const:`None` if the archive does contain the module, but has no source
for it.
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.. method:: is_package(fullname)
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Return True if the module specified by *fullname* is a package. Raise
:exc:`ZipImportError` if the module couldn't be found.
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.. method:: load_module(fullname)
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Load the module specified by *fullname*. *fullname* must be the fully
qualified (dotted) module name. It returns the imported module, or raises
:exc:`ZipImportError` if it wasn't found.
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.. attribute:: archive
The file name of the importer's associated ZIP file, without a possible
subpath.
.. attribute:: prefix
The subpath within the ZIP file where modules are searched. This is the
empty string for zipimporter objects which point to the root of the ZIP
file.
The :attr:`archive` and :attr:`prefix` attributes, when combined with a
slash, equal the original *archivepath* argument given to the
:class:`zipimporter` constructor.
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.. _zipimport-examples:
Examples
--------
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Here is an example that imports a module from a ZIP archive - note that the
:mod:`zipimport` module is not explicitly used. ::
$ unzip -l /tmp/example.zip
Archive: /tmp/example.zip
Length Date Time Name
-------- ---- ---- ----
8467 11-26-02 22:30 jwzthreading.py
-------- -------
8467 1 file
$ ./python
Merged revisions 68133-68134,68141-68142,68145-68146,68148-68149,68159-68162,68166,68171-68174,68179,68195-68196,68210,68214-68215,68217-68222 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r68133 | antoine.pitrou | 2009-01-01 16:38:03 +0100 (Thu, 01 Jan 2009) | 1 line fill in actual issue number in tests ........ r68134 | hirokazu.yamamoto | 2009-01-01 16:45:39 +0100 (Thu, 01 Jan 2009) | 2 lines Issue #4797: IOError.filename was not set when _fileio.FileIO failed to open file with `str' filename on Windows. ........ r68141 | benjamin.peterson | 2009-01-01 17:43:12 +0100 (Thu, 01 Jan 2009) | 1 line fix highlighting ........ r68142 | benjamin.peterson | 2009-01-01 18:29:49 +0100 (Thu, 01 Jan 2009) | 2 lines welcome to 2009, Python! ........ r68145 | amaury.forgeotdarc | 2009-01-02 01:03:54 +0100 (Fri, 02 Jan 2009) | 5 lines #4801 _collections module fails to build on cygwin. _PyObject_GC_TRACK is the macro version of PyObject_GC_Track, and according to documentation it should not be used for extension modules. ........ r68146 | ronald.oussoren | 2009-01-02 11:44:46 +0100 (Fri, 02 Jan 2009) | 2 lines Fix for issue4472: "configure --enable-shared doesn't work on OSX" ........ r68148 | ronald.oussoren | 2009-01-02 11:48:31 +0100 (Fri, 02 Jan 2009) | 2 lines Forgot to add a NEWS item in my previous checkin ........ r68149 | ronald.oussoren | 2009-01-02 11:50:48 +0100 (Fri, 02 Jan 2009) | 2 lines Fix for issue4780 ........ r68159 | ronald.oussoren | 2009-01-02 15:48:17 +0100 (Fri, 02 Jan 2009) | 2 lines Fix for issue 1627952 ........ r68160 | ronald.oussoren | 2009-01-02 15:52:09 +0100 (Fri, 02 Jan 2009) | 2 lines Fix for issue r1737832 ........ r68161 | ronald.oussoren | 2009-01-02 16:00:05 +0100 (Fri, 02 Jan 2009) | 3 lines Fix for issue 1149804 ........ r68162 | ronald.oussoren | 2009-01-02 16:06:00 +0100 (Fri, 02 Jan 2009) | 3 lines Fix for issue 4472 is incompatible with Cygwin, this patch should fix that. ........ r68166 | benjamin.peterson | 2009-01-02 19:26:23 +0100 (Fri, 02 Jan 2009) | 1 line document PyMemberDef ........ r68171 | georg.brandl | 2009-01-02 21:25:14 +0100 (Fri, 02 Jan 2009) | 3 lines #4811: fix markup glitches (mostly remains of the conversion), found by Gabriel Genellina. ........ r68172 | martin.v.loewis | 2009-01-02 21:32:55 +0100 (Fri, 02 Jan 2009) | 2 lines Issue #4075: Use OutputDebugStringW in Py_FatalError. ........ r68173 | martin.v.loewis | 2009-01-02 21:40:14 +0100 (Fri, 02 Jan 2009) | 2 lines Issue #4051: Prevent conflict of UNICODE macros in cPickle. ........ r68174 | benjamin.peterson | 2009-01-02 21:47:27 +0100 (Fri, 02 Jan 2009) | 1 line fix compilation on non-Windows platforms ........ r68179 | raymond.hettinger | 2009-01-02 22:26:45 +0100 (Fri, 02 Jan 2009) | 1 line Issue #4615. Document how to use itertools for de-duping. ........ r68195 | georg.brandl | 2009-01-03 14:45:15 +0100 (Sat, 03 Jan 2009) | 2 lines Remove useless string literal. ........ r68196 | georg.brandl | 2009-01-03 15:29:53 +0100 (Sat, 03 Jan 2009) | 2 lines Fix indentation. ........ r68210 | georg.brandl | 2009-01-03 20:10:12 +0100 (Sat, 03 Jan 2009) | 2 lines Set eol-style correctly for mp_distributing.py. ........ r68214 | georg.brandl | 2009-01-03 20:44:48 +0100 (Sat, 03 Jan 2009) | 2 lines Make indentation consistent. ........ r68215 | georg.brandl | 2009-01-03 21:15:14 +0100 (Sat, 03 Jan 2009) | 2 lines Fix role name. ........ r68217 | georg.brandl | 2009-01-03 21:30:15 +0100 (Sat, 03 Jan 2009) | 2 lines Add rstlint, a little tool to find subtle markup problems and inconsistencies in the Doc sources. ........ r68218 | georg.brandl | 2009-01-03 21:38:59 +0100 (Sat, 03 Jan 2009) | 2 lines Recognize usage of the default role. ........ r68219 | georg.brandl | 2009-01-03 21:47:01 +0100 (Sat, 03 Jan 2009) | 2 lines Fix uses of the default role. ........ r68220 | georg.brandl | 2009-01-03 21:55:06 +0100 (Sat, 03 Jan 2009) | 2 lines Remove trailing whitespace. ........ r68221 | georg.brandl | 2009-01-03 22:04:55 +0100 (Sat, 03 Jan 2009) | 2 lines Remove tabs from the documentation. ........ r68222 | georg.brandl | 2009-01-03 22:11:58 +0100 (Sat, 03 Jan 2009) | 2 lines Disable the line length checker by default. ........
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Python 2.3 (#1, Aug 1 2003, 19:54:32)
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>>> import sys
>>> sys.path.insert(0, '/tmp/example.zip') # Add .zip file to front of path
>>> import jwzthreading
>>> jwzthreading.__file__
'/tmp/example.zip/jwzthreading.py'