实现装饰器模式示例，添加相关类和方法，增强代码可读性

python/decorator/main.py

@@ -0,0 +1,48 @@
+"""
+实例
+汤宝宝家有一台咖啡机，他会自动给美式咖啡加奶和糖...
+"""
+
+from abc import ABC, abstractmethod
+
+
+class Drink(ABC):
+    price: float
+    name: str
+
+    @abstractmethod
+    def cost(self) -> None:
+        pass
+
+
+class Coffee(Drink):
+    def __init__(self, name: str, price: float) -> None:
+        self.name = name
+        self.price = price
+
+    def cost(self) -> None:
+        print(f"一杯{self.name}咖啡，价格{self.price:.2f}元")
+
+
+class Maker:
+    def __init__(self, drink: Drink, milk_price: float, sugar_price: float) -> None:
+        self.drink = drink
+        self.milk_price = milk_price
+        self.sugar_price = sugar_price
+
+    def cost(self) -> None:
+        self.drink.cost()
+        print(
+            f"加了奶和糖，总价{self.drink.price + self.milk_price + self.sugar_price:.2f}元。"
+        )
+
+
+if __name__ == "__main__":
+    print("============= 装饰器模式 =============")
+    print("自己泡杯咖啡")
+    coffee = Coffee("美式", 10.0)
+    coffee.cost()
+    print("\n用咖啡机泡杯咖啡")
+    new_coffee = Maker(coffee, milk_price=1.0, sugar_price=1.0)
+    new_coffee.cost()
+    print("\n=========== 装饰器模式结束 ===========")