diff options
Diffstat (limited to 'Doc/library/zipfile.rst')
| -rw-r--r-- | Doc/library/zipfile.rst | 130 |
1 files changed, 94 insertions, 36 deletions
diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst index 1d6526c..bf52fa3 100644 --- a/Doc/library/zipfile.rst +++ b/Doc/library/zipfile.rst @@ -147,10 +147,10 @@ ZipFile Objects *compression* is the ZIP compression method to use when writing the archive, and should be :const:`ZIP_STORED`, :const:`ZIP_DEFLATED`, :const:`ZIP_BZIP2` or :const:`ZIP_LZMA`; unrecognized - values will cause :exc:`RuntimeError` to be raised. If :const:`ZIP_DEFLATED`, + values will cause :exc:`NotImplementedError` to be raised. If :const:`ZIP_DEFLATED`, :const:`ZIP_BZIP2` or :const:`ZIP_LZMA` is specified but the corresponding module (:mod:`zlib`, :mod:`bz2` or :mod:`lzma`) is not available, :exc:`RuntimeError` - is also raised. The default is :const:`ZIP_STORED`. If *allowZip64* is + is raised. The default is :const:`ZIP_STORED`. If *allowZip64* is ``True`` (the default) zipfile will create ZIP files that use the ZIP64 extensions when the zipfile is larger than 2 GiB. If it is false :mod:`zipfile` will raise an exception when the ZIP file would require ZIP64 extensions. @@ -179,6 +179,10 @@ ZipFile Objects Added support for writing to unseekable streams. Added support for the ``'x'`` mode. + .. versionchanged:: 3.6 + Previously, a plain :exc:`RuntimeError` was raised for unrecognized + compression values. + .. method:: ZipFile.close() @@ -205,18 +209,12 @@ ZipFile Objects Return a list of archive members by name. -.. index:: - single: universal newlines; zipfile.ZipFile.open method - -.. method:: ZipFile.open(name, mode='r', pwd=None) +.. method:: ZipFile.open(name, mode='r', pwd=None, *, force_zip64=False) - Extract a member from the archive as a file-like object (ZipExtFile). *name* - is the name of the file in the archive, or a :class:`ZipInfo` object. The - *mode* parameter, if included, must be one of the following: ``'r'`` (the - default), ``'U'``, or ``'rU'``. Choosing ``'U'`` or ``'rU'`` will enable - :term:`universal newlines` support in the read-only object. *pwd* is the - password used for encrypted files. Calling :meth:`.open` on a closed - ZipFile will raise a :exc:`RuntimeError`. + 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:: @@ -225,17 +223,23 @@ ZipFile Objects with myzip.open('eggs.txt') as myfile: print(myfile.read()) - .. note:: + 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:`__iter__`, + :meth:`~iterator.__next__`. These objects can operate independently of + the ZipFile. - The file-like object is read-only and provides the following methods: - :meth:`~io.BufferedIOBase.read`, :meth:`~io.IOBase.readline`, - :meth:`~io.IOBase.readlines`, :meth:`__iter__`, - :meth:`~iterator.__next__`. + 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`. - .. note:: - - Objects returned by :meth:`.open` can operate independently of the - ZipFile. + 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:: @@ -243,10 +247,19 @@ ZipFile Objects or a :class:`ZipInfo` object. You will appreciate this when trying to read a ZIP file that contains members with duplicate names. - .. deprecated-removed:: 3.4 3.6 - The ``'U'`` or ``'rU'`` mode. Use :class:`io.TextIOWrapper` for reading + .. 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* @@ -267,6 +280,10 @@ ZipFile Objects 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. + .. method:: ZipFile.extractall(path=None, members=None, pwd=None) @@ -283,6 +300,10 @@ ZipFile Objects 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. + .. method:: ZipFile.printdir() @@ -300,18 +321,24 @@ ZipFile Objects 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 closed ZipFile will raise a :exc:`RuntimeError`. 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``. Calling - :meth:`testzip` on a closed ZipFile will raise a :exc:`RuntimeError`. + Return the name of the first bad file, or else return ``None``. + + .. versionchanged:: 3.6 + Calling :meth:`testfile` on a closed ZipFile will raise a + :exc:`ValueError`. Previously, a :exc:`RuntimeError` was raised. .. method:: ZipFile.write(filename, arcname=None, compress_type=None) @@ -321,10 +348,7 @@ ZipFile Objects 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. - The archive must be open with mode ``'w'``, ``'x'`` or ``'a'`` -- calling - :meth:`write` on a ZipFile created with mode ``'r'`` will raise a - :exc:`RuntimeError`. Calling :meth:`write` on a closed ZipFile will raise a - :exc:`RuntimeError`. + The archive must be open with mode ``'w'``, ``'x'`` or ``'a'``. .. note:: @@ -343,16 +367,19 @@ ZipFile Objects 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]) Write the string *data* to the archive; *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'`` -- calling - :meth:`writestr` on a ZipFile created with mode ``'r'`` will raise a - :exc:`RuntimeError`. Calling :meth:`writestr` on a closed ZipFile will - raise a :exc:`RuntimeError`. + 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* @@ -368,6 +395,12 @@ ZipFile Objects .. 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: @@ -465,7 +498,31 @@ 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. -Instances have the following attributes: +There is one classmethod to make a :class:`ZipInfo` instance for a filesystem +file: + +.. classmethod:: ZipInfo.from_file(filename, arcname=None) + + 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. + + .. versionadded:: 3.6 + +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 @@ -574,4 +631,5 @@ Instances have the following attributes: Size of the uncompressed file. + .. _PKZIP Application Note: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT |