工厂模式

from abc import abstractclassmethod,ABCMeta

class Payment(metaclass=ABCMeta):
    @abstractclassmethod
    def pay(self,money):
        raise NotImplementedError

class Alipay(Payment):
    def __init__(self,enable_yuebao=False):
        self.enable_yuebao = enable_yuebao

    def pay(self,money):
        if self.enable_yuebao:
            print('余额宝支付了%s元'%money)
        else:
            print('支付宝支付了%s元'%money)

class ApplePay(Payment):
    def pay(self,money):
        print('苹果支付了%s元'%money)


class PaymentFactory: #工厂类 封装了对象创建的细节
    def create_payment(self,method):
        if method == 'alipay':
            return Alipay()  ##创建Alipay对象
        elif method == 'applepay':
            return ApplePay()
        elif method == 'yuebao':
            return Alipay(True)
        else:
            raise NameError(method)

factory = PaymentFactory()  
payment = factory.create_payment('yuebao')   #创建Alipay对象
payment.pay(123)