Function compress

Lib/gzip.py:622–636

Compress data in one shot and return the compressed string. compresslevel sets the compression level in range of 0-9. mtime can be used to set the modification time. The modification time is set to 0 by default, for reproducibility.

(data, compresslevel=_COMPRESS_LEVEL_TRADEOFF, *, mtime=0)

def compress(data, compresslevel=_COMPRESS_LEVEL_TRADEOFF, *, mtime=0):
    """Compress data in one shot and return the compressed string.

    compresslevel sets the compression level in range of 0-9.
    mtime can be used to set the modification time.
    The modification time is set to 0 by default, for reproducibility.
    """
    # Wbits=31 automatically includes a gzip header and trailer.
    gzip_data = zlib.compress(data, level=compresslevel, wbits=31)
    if mtime is None:
        mtime = time.time()
    # Reuse gzip header created by zlib, replace mtime and OS byte for
    # consistency.
    header = struct.pack("<4sLBB", gzip_data, int(mtime), gzip_data[8], 255)
    return header + gzip_data[10:]


def decompress(data):