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Diffstat (limited to 'Doc/library/gzip.rst')
| -rw-r--r-- | Doc/library/gzip.rst | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/Doc/library/gzip.rst b/Doc/library/gzip.rst index ce02077..9492716 100644 --- a/Doc/library/gzip.rst +++ b/Doc/library/gzip.rst @@ -90,13 +90,9 @@ The module defines the following items: is no compression. The default is ``9``. The *mtime* argument is an optional numeric timestamp to be written to - the stream when compressing. All :program:`gzip` compressed streams are - required to contain a timestamp. If omitted or ``None``, the current - time is used. This module ignores the timestamp when decompressing; - however, some programs, such as :program:`gunzip`\ , make use of it. - The format of the timestamp is the same as that of the return value of - ``time.time()`` and of the ``st_mtime`` attribute of the object returned - by ``os.stat()``. + the last modification time field in the stream when compressing. It + should only be provided in compression mode. If omitted or ``None``, the + current time is used. See the :attr:`mtime` attribute for more details. Calling a :class:`GzipFile` object's :meth:`close` method does not close *fileobj*, since you might wish to append more material after the compressed @@ -108,9 +104,9 @@ The module defines the following items: including iteration and the :keyword:`with` statement. Only the :meth:`truncate` method isn't implemented. - :class:`GzipFile` also provides the following method: + :class:`GzipFile` also provides the following method and attribute: - .. method:: peek([n]) + .. method:: peek(n) Read *n* uncompressed bytes without advancing the file position. At most one single read on the compressed stream is done to satisfy @@ -124,9 +120,21 @@ The module defines the following items: .. versionadded:: 3.2 + .. attribute:: mtime + + When decompressing, the value of the last modification time field in + the most recently read header may be read from this attribute, as an + integer. The initial value before reading any headers is ``None``. + + All :program:`gzip` compressed streams are required to contain this + timestamp field. Some programs, such as :program:`gunzip`\ , make use + of the timestamp. The format is the same as the return value of + :func:`time.time` and the :attr:`~os.stat_result.st_mtime` attribute of + the object returned by :func:`os.stat`. + .. versionchanged:: 3.1 Support for the :keyword:`with` statement was added, along with the - *mtime* argument. + *mtime* constructor argument and :attr:`mtime` attribute. .. versionchanged:: 3.2 Support for zero-padded and unseekable files was added. @@ -137,6 +145,12 @@ The module defines the following items: .. versionchanged:: 3.4 Added support for the ``'x'`` and ``'xb'`` modes. + .. versionchanged:: 3.5 + Added support for writing arbitrary + :term:`bytes-like objects <bytes-like object>`. + The :meth:`~io.BufferedIOBase.read` method now accepts an argument of + ``None``. + .. function:: compress(data, compresslevel=9) @@ -175,9 +189,10 @@ Example of how to create a compressed GZIP file:: Example of how to GZIP compress an existing file:: import gzip + import shutil with open('/home/joe/file.txt', 'rb') as f_in: with gzip.open('/home/joe/file.txt.gz', 'wb') as f_out: - f_out.writelines(f_in) + shutil.copyfileobj(f_in, f_out) Example of how to GZIP compress a binary string:: |