(self, filename=None, mode=None,
                 compresslevel=9, fileobj=None, mtime=None)
Constructor for the GzipFile class.

        At least one of fileobj and filename must be given a
        non-trivial value.

        The new class instance is based on fileobj, which can be a regular
        file, a StringIO object, or any other object which simulates a file.
        It defaults to None, in which case filename is opened to provide
        a file object.

        When fileobj is not None, the filename argument is only used to be
        included in the gzip file header, which may includes the original
        filename of the uncompressed file.  It defaults to the filename of
        fileobj, if discernible; otherwise, it defaults to the empty string,
        and in this case the original filename is not included in the header.

        The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb',
        depending on whether the file will be read or written.  The default
        is the mode of fileobj if discernible; otherwise, the default is 'rb'.
        A mode of 'r' is equivalent to one of 'rb', and similarly for 'w' and
        'wb', and 'a' and 'ab'.

        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.

        The mtime argument is an optional numeric timestamp to be written
        to the stream when compressing.  All 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 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 member of the
        object returned by os.stat().
Constructor for the GzipFile class.
Constructor for the GzipFile class .
def __init__(self, filename=None, mode=None,
                 compresslevel=9, fileobj=None, mtime=None):
        """Constructor for the GzipFile class.

        At least one of fileobj and filename must be given a
        non-trivial value.

        The new class instance is based on fileobj, which can be a regular
        file, a StringIO object, or any other object which simulates a file.
        It defaults to None, in which case filename is opened to provide
        a file object.

        When fileobj is not None, the filename argument is only used to be
        included in the gzip file header, which may includes the original
        filename of the uncompressed file.  It defaults to the filename of
        fileobj, if discernible; otherwise, it defaults to the empty string,
        and in this case the original filename is not included in the header.

        The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb',
        depending on whether the file will be read or written.  The default
        is the mode of fileobj if discernible; otherwise, the default is 'rb'.
        A mode of 'r' is equivalent to one of 'rb', and similarly for 'w' and
        'wb', and 'a' and 'ab'.

        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.

        The mtime argument is an optional numeric timestamp to be written
        to the stream when compressing.  All 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 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 member of the
        object returned by os.stat().

        """

        if mode and ('t' in mode or 'U' in mode):
            raise IOError("Mode " + mode + " not supported")
        if mode and 'b' not in mode:
            mode += 'b'
        if fileobj is None:
            fileobj = self.myfileobj = builtins.open(filename, mode or 'rb')
        if filename is None:
            if hasattr(fileobj, 'name') and isinstance(fileobj.name, str):
                filename = fileobj.name
            else:
                filename = ''
        if mode is None:
            if hasattr(fileobj, 'mode'): mode = fileobj.mode
            else: mode = 'rb'

        if mode[0:1] == 'r':
            self.mode = READ
            # Set flag indicating start of a new member
            self._new_member = True
            # Buffer data read from gzip file. extrastart is offset in
            # stream where buffer starts. extrasize is number of
            # bytes remaining in buffer from current stream position.
            self.extrabuf = b""
            self.extrasize = 0
            self.extrastart = 0
            self.name = filename
            # Starts small, scales exponentially
            self.min_readsize = 100
            fileobj = _PaddedFile(fileobj)

        elif mode[0:1] == 'w' or mode[0:1] == 'a':
            self.mode = WRITE
            self._init_write(filename)
            self.compress = zlib.compressobj(compresslevel,
                                             zlib.DEFLATED,
                                             -zlib.MAX_WBITS,
                                             zlib.DEF_MEM_LEVEL,
                                             0)
        else:
            raise IOError("Mode " + mode + " not supported")

        self.fileobj = fileobj
        self.offset = 0
        self.mtime = mtime

        if self.mode == WRITE:
            self._write_gzip_header()
def __init__ ( self , filename = None , mode = None , compresslevel = 9 , fileobj = None , mtime = None ) : if mode and ( 't' in mode or 'U' in mode ) : raise IOError ( "Mode " + mode + " not supported" ) if mode and 'b' not in mode : mode += 'b' if fileobj is None : fileobj = self . myfileobj = builtins . open ( filename , mode or 'rb' ) if filename is None : if hasattr ( fileobj , 'name' ) and isinstance ( fileobj . name , str ) : filename = fileobj . name else : filename = '' if mode is None : if hasattr ( fileobj , 'mode' ) : mode = fileobj . mode else : mode = 'rb' if mode [ 0 : 1 ] == 'r' : self . mode = READ # Set flag indicating start of a new member self . _new_member = True # Buffer data read from gzip file. extrastart is offset in # stream where buffer starts. extrasize is number of # bytes remaining in buffer from current stream position. self . extrabuf = b"" self . extrasize = 0 self . extrastart = 0 self . name = filename # Starts small, scales exponentially self . min_readsize = 100 fileobj = _PaddedFile ( fileobj ) elif mode [ 0 : 1 ] == 'w' or mode [ 0 : 1 ] == 'a' : self . mode = WRITE self . _init_write ( filename ) self . compress = zlib . compressobj ( compresslevel , zlib . DEFLATED , - zlib . MAX_WBITS , zlib . DEF_MEM_LEVEL , 0 ) else : raise IOError ( "Mode " + mode + " not supported" ) self . fileobj = fileobj self . offset = 0 self . mtime = mtime if self . mode == WRITE : self . _write_gzip_header ( )