def __init__(self, buf, offset):
        """
        Constructor.
        Arguments:
        - `buf`: Byte string containing stuff to parse.
        - `offset`: The offset into the buffer at which the block starts.
        """
        self._buf = buf
        self._offset = offset
        self._implicit_offset = 0
def __init__ ( self , buf , offset ) : self . _buf = buf self . _offset = offset self . _implicit_offset = 0
Constructor.
        Arguments:
        - `buf`: Byte string containing stuff to parse.
        - `offset`: The offset into the buffer at which the block starts.