def __iadd__(self, instruction):
        """Add the instruction to the list of instructions.  Allows "+="
        syntax."""

        if isinstance(instruction, list):
            self.__instructions_bb.extend(instruction)
        else:
            self.__instructions_bb.append(instruction)
        return self
Add the instruction to the list of instructions.  Allows "+="
        syntax.
hpccm/building_blocks/base.py