.. module:: zipfile :synopsis: Read and write ZIP-format archive files.
.. moduleauthor:: James C. Ahlstrom <jim@interet.com>
.. sectionauthor:: James C. Ahlstrom <jim@interet.com>
Source code: :source:`Lib/zipfile.py`
The ZIP file format is a common archive and compression standard. This module provides tools to create, read, write, append, and list a ZIP file. Any advanced use of this module will require an understanding of the format, as defined in :ref:`zipfile-objects` for constructor details.
A pathlib-compatible wrapper for zip files. See section :ref:`path-objects` for details.
.. versionadded:: 3.8
Class for creating ZIP archives containing Python libraries.
Class used to represent information about a member of an archive. Instances of this class are returned by the :meth:`.getinfo` and :meth:`.infolist` methods of :class:`ZipFile` objects. Most users of the :mod:`zipfile` module will not need to create these, but only use those created by this module. filename should be the full name of the archive member, and date_time should be a tuple containing six fields which describe the time of the last modification to the file; the fields are described in section :ref:`zipinfo-objects`.
.. function:: is_zipfile(filename) Returns ``True`` if *filename* is a valid ZIP file based on its magic number, otherwise returns ``False``. *filename* may be a file or file-like object too. .. versionchanged:: 3.1 Support for file and file-like objects.
.. data:: ZIP_STORED The numeric constant for an uncompressed archive member.
.. data:: ZIP_DEFLATED The numeric constant for the usual ZIP compression method. This requires the :mod:`zlib` module.
.. data:: ZIP_BZIP2 The numeric constant for the BZIP2 compression method. This requires the :mod:`bz2` module. .. versionadded:: 3.3
.. data:: ZIP_LZMA The numeric constant for the LZMA compression method. This requires the :mod:`lzma` module. .. versionadded:: 3.3 .. note:: The ZIP file format specification has included support for bzip2 compression since 2001, and for LZMA compression since 2006. However, some tools (including older Python releases) do not support these compression methods, and may either refuse to process the ZIP file altogether, or fail to extract individual files.
.. seealso:: `PKZIP Application Note`_ Documentation on the ZIP file format by Phil Katz, the creator of the format and algorithms used. `Info-ZIP Home Page <http://www.info-zip.org/>`_ Information about the Info-ZIP project's ZIP archive programs and development libraries.
.. method:: ZipFile.close() Close the archive file. You must call :meth:`close` before exiting your program or essential records will not be written.
.. method:: ZipFile.getinfo(name) Return a :class:`ZipInfo` object with information about the archive member *name*. Calling :meth:`getinfo` for a name not currently contained in the archive will raise a :exc:`KeyError`.
.. method:: ZipFile.infolist() Return a list containing a :class:`ZipInfo` object for each member of the archive. The objects are in the same order as their entries in the actual ZIP file on disk if an existing archive was opened.
.. method:: ZipFile.namelist() Return a list of archive members by name.
.. method:: ZipFile.open(name, mode='r', pwd=None, *, force_zip64=False)
Access a member of the archive as a binary file-like object. *name*
can be either the name of a file within the archive or a :class:`ZipInfo`
object. The *mode* parameter, if included, must be ``'r'`` (the default)
or ``'w'``. *pwd* is the password used to decrypt encrypted ZIP files.
:meth:`~ZipFile.open` is also a context manager and therefore supports the
:keyword:`with` statement::
with ZipFile('spam.zip') as myzip:
with myzip.open('eggs.txt') as myfile:
print(myfile.read())
With *mode* ``'r'`` the file-like object
(``ZipExtFile``) is read-only and provides the following methods:
:meth:`~io.BufferedIOBase.read`, :meth:`~io.IOBase.readline`,
:meth:`~io.IOBase.readlines`, :meth:`~io.IOBase.seek`,
:meth:`~io.IOBase.tell`, :meth:`__iter__`, :meth:`~iterator.__next__`.
These objects can operate independently of the ZipFile.
With ``mode='w'``, a writable file handle is returned, which supports the
:meth:`~io.BufferedIOBase.write` method. While a writable file handle is open,
attempting to read or write other files in the ZIP file will raise a
:exc:`ValueError`.
When writing a file, if the file size is not known in advance but may exceed
2 GiB, pass ``force_zip64=True`` to ensure that the header format is
capable of supporting large files. If the file size is known in advance,
construct a :class:`ZipInfo` object with :attr:`~ZipInfo.file_size` set, and
use that as the *name* parameter.
.. note::
The :meth:`.open`, :meth:`read` and :meth:`extract` methods can take a filename
or a :class:`ZipInfo` object. You will appreciate this when trying to read a
ZIP file that contains members with duplicate names.
.. versionchanged:: 3.6
Removed support of ``mode='U'``. Use :class:`io.TextIOWrapper` for reading
compressed text files in :term:`universal newlines` mode.
.. versionchanged:: 3.6
:meth:`open` can now be used to write files into the archive with the
``mode='w'`` option.
.. versionchanged:: 3.6
Calling :meth:`.open` on a closed ZipFile will raise a :exc:`ValueError`.
Previously, a :exc:`RuntimeError` was raised.
.. method:: ZipFile.extract(member, path=None, pwd=None) Extract a member from the archive to the current working directory; *member* must be its full name or a :class:`ZipInfo` object. Its file information is extracted as accurately as possible. *path* specifies a different directory to extract to. *member* can be a filename or a :class:`ZipInfo` object. *pwd* is the password used for encrypted files. Returns the normalized path created (a directory or new file). .. note:: If a member filename is an absolute path, a drive/UNC sharepoint and leading (back)slashes will be stripped, e.g.: ``///foo/bar`` becomes ``foo/bar`` on Unix, and ``C:\foo\bar`` becomes ``foo\bar`` on Windows. And all ``".."`` components in a member filename will be removed, e.g.: ``../../foo../../ba..r`` becomes ``foo../ba..r``. On Windows illegal characters (``:``, ``<``, ``>``, ``|``, ``"``, ``?``, and ``*``) replaced by underscore (``_``). .. versionchanged:: 3.6 Calling :meth:`extract` on a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised. .. versionchanged:: 3.6.2 The *path* parameter accepts a :term:`path-like object`.
.. method:: ZipFile.extractall(path=None, members=None, pwd=None) Extract all members from the archive to the current working directory. *path* specifies a different directory to extract to. *members* is optional and must be a subset of the list returned by :meth:`namelist`. *pwd* is the password used for encrypted files. .. warning:: Never extract archives from untrusted sources without prior inspection. It is possible that files are created outside of *path*, e.g. members that have absolute filenames starting with ``"/"`` or filenames with two dots ``".."``. This module attempts to prevent that. See :meth:`extract` note. .. versionchanged:: 3.6 Calling :meth:`extractall` on a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised. .. versionchanged:: 3.6.2 The *path* parameter accepts a :term:`path-like object`.
.. method:: ZipFile.printdir() Print a table of contents for the archive to ``sys.stdout``.
.. method:: ZipFile.setpassword(pwd) Set *pwd* as default password to extract encrypted files.
.. method:: ZipFile.read(name, pwd=None) Return the bytes of the file *name* in the archive. *name* is the name of the file in the archive, or a :class:`ZipInfo` object. The archive must be open for read or append. *pwd* is the password used for encrypted files and, if specified, it will override the default password set with :meth:`setpassword`. Calling :meth:`read` on a ZipFile that uses a compression method other than :const:`ZIP_STORED`, :const:`ZIP_DEFLATED`, :const:`ZIP_BZIP2` or :const:`ZIP_LZMA` will raise a :exc:`NotImplementedError`. An error will also be raised if the corresponding compression module is not available. .. versionchanged:: 3.6 Calling :meth:`read` on a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised.
.. method:: ZipFile.testzip() Read all the files in the archive and check their CRC's and file headers. Return the name of the first bad file, or else return ``None``. .. versionchanged:: 3.6 Calling :meth:`testzip` on a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised.
.. method:: ZipFile.write(filename, arcname=None, compress_type=None, \ compresslevel=None) Write the file named *filename* to the archive, giving it the archive name *arcname* (by default, this will be the same as *filename*, but without a drive letter and with leading path separators removed). If given, *compress_type* overrides the value given for the *compression* parameter to the constructor for the new entry. Similarly, *compresslevel* will override the constructor if given. The archive must be open with mode ``'w'``, ``'x'`` or ``'a'``. .. note:: Archive names should be relative to the archive root, that is, they should not start with a path separator. .. note:: If ``arcname`` (or ``filename``, if ``arcname`` is not given) contains a null byte, the name of the file in the archive will be truncated at the null byte. .. versionchanged:: 3.6 Calling :meth:`write` on a ZipFile created with mode ``'r'`` or a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised.
.. method:: ZipFile.writestr(zinfo_or_arcname, data, compress_type=None, \ compresslevel=None) Write a file into the archive. The contents is *data*, which may be either a :class:`str` or a :class:`bytes` instance; if it is a :class:`str`, it is encoded as UTF-8 first. *zinfo_or_arcname* is either the file name it will be given in the archive, or a :class:`ZipInfo` instance. If it's an instance, at least the filename, date, and time must be given. If it's a name, the date and time is set to the current date and time. The archive must be opened with mode ``'w'``, ``'x'`` or ``'a'``. If given, *compress_type* overrides the value given for the *compression* parameter to the constructor for the new entry, or in the *zinfo_or_arcname* (if that is a :class:`ZipInfo` instance). Similarly, *compresslevel* will override the constructor if given. .. note:: When passing a :class:`ZipInfo` instance as the *zinfo_or_arcname* parameter, the compression method used will be that specified in the *compress_type* member of the given :class:`ZipInfo` instance. By default, the :class:`ZipInfo` constructor sets this member to :const:`ZIP_STORED`. .. versionchanged:: 3.2 The *compress_type* argument. .. versionchanged:: 3.6 Calling :meth:`writestr` on a ZipFile created with mode ``'r'`` or a closed ZipFile will raise a :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised.
The following data attributes are also available:
.. attribute:: ZipFile.filename Name of the ZIP file.
.. attribute:: ZipFile.debug The level of debug output to use. This may be set from ``0`` (the default, no output) to ``3`` (the most output). Debugging information is written to ``sys.stdout``.
.. attribute:: ZipFile.comment The comment associated with the ZIP file as a :class:`bytes` object. If assigning a comment to a :class:`ZipFile` instance created with mode ``'w'``, ``'x'`` or ``'a'``, it should be no longer than 65535 bytes. Comments longer than this will be truncated.
Construct a Path object from a root zipfile (which may be a
:class:`ZipFile` instance or file suitable for passing to
the :class:`ZipFile` constructor).
at specifies the location of this Path within the zipfile,
e.g. 'dir/file.txt', 'dir/', or ''. Defaults to the empty string,
indicating the root.
Path objects expose the following features of :mod:`pathlib.Path` objects:
Path objects are traversable using the / operator.
.. attribute:: Path.name The final path component.
.. method:: Path.open(*, **) Invoke :meth:`ZipFile.open` on the current path. Accepts the same arguments as :meth:`ZipFile.open`.
.. method:: Path.iterdir() Enumerate the children of the current directory.
.. method:: Path.is_dir() Return ``True`` if the current context references a directory.
.. method:: Path.is_file() Return ``True`` if the current context references a file.
.. method:: Path.exists() Return ``True`` if the current context references a file or directory in the zip file.
.. method:: Path.read_text(*, **) Read the current file as unicode text. Positional and keyword arguments are passed through to :class:`io.TextIOWrapper` (except ``buffer``, which is implied by the context).
.. method:: Path.read_bytes() Read the current file as bytes.
The :class:`PyZipFile` constructor takes the same parameters as the :class:`ZipFile` constructor, and one additional parameter, optimize.
Instances of the :class:`ZipInfo` class are returned by the :meth:`.getinfo` and :meth:`.infolist` methods of :class:`ZipFile` objects. Each object stores information about a single member of the ZIP archive.
There is one classmethod to make a :class:`ZipInfo` instance for a filesystem file:
.. classmethod:: ZipInfo.from_file(filename, arcname=None, *, \ strict_timestamps=True) Construct a :class:`ZipInfo` instance for a file on the filesystem, in preparation for adding it to a zip file. *filename* should be the path to a file or directory on the filesystem. If *arcname* is specified, it is used as the name within the archive. If *arcname* is not specified, the name will be the same as *filename*, but with any drive letter and leading path separators removed. The *strict_timestamps* argument, when set to ``False``, allows to zip files older than 1980年01月01日 at the cost of setting the timestamp to 1980年01月01日. Similar behavior occurs with files newer than 2107年12月31日, the timestamp is also set to the limit. .. versionadded:: 3.6 .. versionchanged:: 3.6.2 The *filename* parameter accepts a :term:`path-like object`. .. versionadded:: 3.8 The *strict_timestamps* keyword-only argument
Instances have the following methods and attributes:
.. method:: ZipInfo.is_dir() Return ``True`` if this archive member is a directory. This uses the entry's name: directories should always end with ``/``. .. versionadded:: 3.6
.. attribute:: ZipInfo.filename Name of the file in the archive.
.. attribute:: ZipInfo.date_time The time and date of the last modification to the archive member. This is a tuple of six values: +-------+--------------------------+ | Index | Value | +=======+==========================+ | ``0`` | Year (>= 1980) | +-------+--------------------------+ | ``1`` | Month (one-based) | +-------+--------------------------+ | ``2`` | Day of month (one-based) | +-------+--------------------------+ | ``3`` | Hours (zero-based) | +-------+--------------------------+ | ``4`` | Minutes (zero-based) | +-------+--------------------------+ | ``5`` | Seconds (zero-based) | +-------+--------------------------+ .. note:: The ZIP file format does not support timestamps before 1980.
.. attribute:: ZipInfo.compress_type Type of compression for the archive member.
.. attribute:: ZipInfo.comment Comment for the individual archive member as a :class:`bytes` object.
.. attribute:: ZipInfo.extra Expansion field data. The `PKZIP Application Note`_ contains some comments on the internal structure of the data contained in this :class:`bytes` object.
.. attribute:: ZipInfo.create_system System which created ZIP archive.
.. attribute:: ZipInfo.create_version PKZIP version which created ZIP archive.
.. attribute:: ZipInfo.extract_version PKZIP version needed to extract archive.
.. attribute:: ZipInfo.reserved Must be zero.
.. attribute:: ZipInfo.flag_bits ZIP flag bits.
.. attribute:: ZipInfo.volume Volume number of file header.
.. attribute:: ZipInfo.internal_attr Internal attributes.
.. attribute:: ZipInfo.external_attr External file attributes.
.. attribute:: ZipInfo.header_offset Byte offset to the file header.
.. attribute:: ZipInfo.CRC CRC-32 of the uncompressed file.
.. attribute:: ZipInfo.compress_size Size of the compressed data.
.. attribute:: ZipInfo.file_size Size of the uncompressed file.
.. program:: zipfile
The :mod:`zipfile` module provides a simple command-line interface to interact with ZIP archives.
If you want to create a new ZIP archive, specify its name after the :option:`-c` option and then list the filename(s) that should be included:
$ python -m zipfile -c monty.zip spam.txt eggs.txt
Passing a directory is also acceptable:
$ python -m zipfile -c monty.zip life-of-brian_1979/
If you want to extract a ZIP archive into the specified directory, use the :option:`-e` option:
$ python -m zipfile -e monty.zip target-dir/
For a list of the files in a ZIP archive, use the :option:`-l` option:
$ python -m zipfile -l monty.zip
.. cmdoption:: -l <zipfile> --list <zipfile> List files in a zipfile.
.. cmdoption:: -c <zipfile> <source1> ... <sourceN> --create <zipfile> <source1> ... <sourceN> Create zipfile from source files.
.. cmdoption:: -e <zipfile> <output_dir> --extract <zipfile> <output_dir> Extract zipfile into target directory.
.. cmdoption:: -t <zipfile> --test <zipfile> Test whether the zipfile is valid or not.
The extraction in zipfile module might fail due to some pitfalls listed below.
Decompression may fail due to incorrect password / CRC checksum / ZIP format or unsupported compression method / decryption.
Exceeding limitations on different file systems can cause decompression failed. Such as allowable characters in the directory entries, length of the file name, length of the pathname, size of a single file, and number of files, etc.
The lack of memory or disk volume would lead to decompression failed. For example, decompression bombs (aka Interruption
Interruption during the decompression, such as pressing control-C or killing the decompression process may result in incomplete decompression of the archive.
Not knowing the default extraction behaviors can cause unexpected decompression results. For example, when extracting the same archive twice, it overwrites files without asking.
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