简单工厂模式（python）

"""
简单工厂模式：在工厂中传入图纸和材料，就能生产出对应的设备对象，让设备做能做的事
"""


class ParentClass(object):
    """
    计算机运行的父类
    """
    def __init__(self, a, b):
        self.a = a
        self.b = b
        pass

    def operation(self):
        """
        操作函数
        :return:
        """
        pass


class AddOp(ParentClass):
    """
    加法
    """
    def __init__(self, a, b):
        super(AddOp, self).__init__(a, b)
        pass

    def operation(self):
        return self.a + self.b


class JianOp(ParentClass):
    """
    减法
    """
    def __init__(self, a, b):
        super(JianOp, self).__init__(a, b)
        pass

    def operation(self):
        return self.a - self.b


class FactoryClass(object):
    """
    简单工厂类
    """
    def __init__(self):
        pass

    def create_class(self, op, a, b):
        if op == "+":
            return AddOp(a, b)
        elif op == "-":
            return JianOp(a, b)


if __name__ == '__main__':
    factory = FactoryClass()
    add = factory.create_class("+", 23, 34)
    print(add.operation())
    jian = factory.create_class("-", 34, 55)
    print(jian.operation())