python实现简单工厂模式

最新推荐文章于 2024-07-02 16:07:00 发布

原创最新推荐文章于 2024-07-02 16:07:00 发布 · 201 阅读

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本文介绍了使用Python的抽象基类(ABC)和工厂模式来创建数学运算类的方法。通过定义一个基础运算类OperationBase，并继承自abc.ABCMeta，实现了加法和减法类的抽象方法calculate。同时，通过OperationFactory工厂类，根据操作符动态返回对应的加法或减法类实例。

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#基础
import abc
class OperationBase(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    def __init__(self, num_1, num_2):
        self.__num1 = num_1
        self.__num2 = num_2

    @property
    def num_1(self):
        return self.__num1

    @property
    def num_2(self):
        return self.__num2

    @abc.abstractmethod
    def calculate(self):
        pass

#加法类

from operation.operation_base import OperationBase
class OperationAdd(OperationBase):
    def __init__(self, num1, num2):
        super().__init__(num1, num2)

    def calculate(self):
        return super().num_1 + super().num_2

#减法类

from operation.operation_base import OperationBase
class OperationSub(OperationBase):
    def __init__(self, num1, num2):
        super().__init__(num1, num2)

    def calculate(self):
        return super().num_1 - super().num_2

#工厂类
from operation.operation_add import OperationAdd
from operation.operation_sub import OperationSub
class OperationFactory(object):
    dics = {'+': OperationAdd, '-': OperationSub}

    @classmethod
    def get_operation(cls, operator):
        if operator in cls.dics:
            return cls.dics.get(operator)
        else:
            raise Exception('该算法未实现')

#方法调用
from operation.operation_factory import OperationFactory

operation = OperationFactory.get_operation('-')(1,2)
print(operation.calculate())