这个策略模式的python实现应该在init方法中使用私有变量吗？

class Context:
    def __init__(self, strategy):
        self.strategy = strategy

    def execute_strategy(self):
        self.strategy.execute()


class Strategy:
    def execute(self):
        pass


class ConcreteStrategyA(Strategy):
    def execute(self):
        print("Executing strategy A")


class ConcreteStrategyB(Strategy):
    def execute(self):
        print("Executing strategy B")


# 使用示例
strategy_a = ConcreteStrategyA()
context = Context(strategy_a)
context.execute_strategy()