Python 3策略/工厂模式:动态继承一个或多个抽象类类型实现的类实例的类型

from abc import ABC, abstractmethod

# Step 1: 定义抽象类
class AbstractClass(ABC):
    @abstractmethod
    def method(self):
        pass

# Step 2: 定义具体类
class ConcreteClassA(AbstractClass):
    def method(self):
        return "ConcreteClassA"

class ConcreteClassB(AbstractClass):
    def method(self):
        return "ConcreteClassB"

# Step 3: 定义策略/工厂类
class StrategyFactory:
    @staticmethod
    def get_instance(condition):
        if condition == "A":
            return ConcreteClassA()
        elif condition == "B":
            return ConcreteClassB()
        else:
            raise ValueError("Invalid condition")

# 使用策略/工厂模式
instance_a = StrategyFactory.get_instance("A")
print(instance_a.method())  # 输出：ConcreteClassA

instance_b = StrategyFactory.get_instance("B")
print(instance_b.method())  # 输出：ConcreteClassB