data.py 文件源码

def __init__(self, filename=None, mode=None, compresslevel=9,
                 fileobj=None, **kwargs):
        """
        Return a buffered gzip file object.

        :param filename: a filesystem path
        :type filename: str
        :param mode: a file mode which can be any of 'r', 'rb', 'a', 'ab',
            'w', or 'wb'
        :type mode: str
        :param compresslevel: The compresslevel argument is an integer from 1
            to 9 controlling the level of compression; 1 is fastest and
            produces the least compression, and 9 is slowest and produces the
            most compression. The default is 9.
        :type compresslevel: int
        :param fileobj: a BytesIO stream to read from instead of a file.
        :type fileobj: BytesIO
        :param size: number of bytes to buffer during calls to read() and write()
        :type size: int
        :rtype: BufferedGzipFile
        """
        GzipFile.__init__(self, filename, mode, compresslevel, fileobj)
        self._size = kwargs.get('size', self.SIZE)
        self._buffer = BytesIO()
        # cStringIO does not support len.
        self._len = 0