def is_jump_back(self, offset, extended_arg):
        """
        Return True if the code at offset is some sort of jump back.
        That is, it is ether "JUMP_FORWARD" or an absolute jump that
        goes forward.
        """
        if self.code[offset] != self.opc.JUMP_ABSOLUTE:
            return False
        return offset > self.get_target(offset, extended_arg)
Return True if the code at offset is some sort of jump back.
        That is, it is ether "JUMP_FORWARD" or an absolute jump that
        goes forward.