59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
"""
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实例：
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汤宝宝买火车票，可以去火车站买，也可以去代售点买，但是汤宝宝选择全都要。然而，火车站总共只剩两张票，这可苦了小明了。
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"""
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from abc import ABC, abstractmethod
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class Seller(ABC):
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@abstractmethod
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def sell(self, name: str) -> bool:
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pass
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class TrainStation(Seller):
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stock: int
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def __init__(self, stock: int) -> None:
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print(f"火车站库存{stock}张票")
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self.stock = stock
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def sell(self, name: str) -> bool:
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print(f"{name}去火车站买票。")
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if self.stock > 0:
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self.stock -= 1
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print(f"{name}在火车站买到一张火车票。")
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return True
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else:
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print(f"火车站没票了，{name}没买到票。")
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return False
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class TicketAgency(Seller):
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name: str
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station: TrainStation
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def __init__(self, name: str, station: TrainStation) -> None:
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self.name = name
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self.station = station
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def sell(self, name: str) -> bool:
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print(f"{name}去{self.name}买票。")
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result = self.station.sell(self.name)
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if result:
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print(f"{name}在{self.name}买到一张火车票。")
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else:
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print(f"{name}在{self.name}没买到票。")
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return result
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if __name__ == "__main__":
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print("============= 代理模式 =============")
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station = TrainStation(stock=2)
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agency = TicketAgency(name="代售点A", station=station)
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station.sell("汤宝宝")
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agency.sell("汤宝宝")
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print("")
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agency.sell("小明")
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station.sell("小明")
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print("\n=========== 代理模式结束 ===========") |