138 lines
4.0 KiB
Python
138 lines
4.0 KiB
Python
class Product:
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def __init__(self, product_id, name, base_price):
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# 封装基本属性
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self._product_id = product_id
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self._name = name
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self._base_price = base_price
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@property
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def product_id(self):
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return self._product_id
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@property
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def name(self):
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return self._name
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@property
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def base_price(self):
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return self._base_price
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def calculate_price(self, quantity=1):
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"""计算商品价格（基础实现）"""
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return self._base_price * quantity
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def display_info(self):
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"""显示商品信息"""
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return f"{self._name} (ID: {self._product_id}) - ${self._base_price:.2f}"
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class DigitalProduct(Product):
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def __init__(self, product_id, name, base_price, license_type):
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super().__init__(product_id, name, base_price)
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# 添加数字商品特有属性
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self._license_type = license_type
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@property
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def license_type(self):
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return self._license_type
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def calculate_price(self, quantity=1):
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"""数字商品价格计算（无数量折扣）"""
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# 数字商品购买数量只能是1
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return self._base_price
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class PhysicalProduct(Product):
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def __init__(self, product_id, name, base_price, weight):
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super().__init__(product_id, name, base_price)
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# 添加实体商品特有属性
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self._weight = weight
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@property
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def weight(self):
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return self._weight
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def calculate_price(self, quantity=1):
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"""实体商品价格计算（有批量折扣）"""
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if quantity >= 10:
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return self._base_price * quantity * 0.9 # 10件以上9折
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return self._base_price * quantity
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class ShoppingCart:
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def __init__(self):
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# 使用字典存储商品和数量 {product: quantity}
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self._items = {}
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def add_item(self, product, quantity=1):
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"""添加商品到购物车"""
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if not isinstance(product, Product):
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raise ValueError("只能添加Product类型商品")
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if product in self._items:
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self._items[product] += quantity
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else:
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self._items[product] = quantity
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def remove_item(self, product, quantity=1):
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"""从购物车移除商品"""
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if product in self._items:
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if self._items[product] <= quantity:
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del self._items[product]
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else:
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self._items[product] -= quantity
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def calculate_total(self):
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"""计算购物车总价"""
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total = 0
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for product, quantity in self._items.items():
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total += product.calculate_price(quantity)
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return total
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def display_cart(self):
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"""显示购物车内容"""
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if not self._items:
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print("购物车是空的")
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return
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print("购物车内容:")
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for product, quantity in self._items.items():
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price = product.calculate_price(quantity)
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print(f"- {product.name} × {quantity}: ${price:.2f}")
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print(f"总计: ${self.calculate_total():.2f}\n")
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# 使用示例
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if __name__ == "__main__":
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# 创建商品
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book = PhysicalProduct("B001", "Python编程书", 39.99, 0.5)
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movie = DigitalProduct("D001", "科幻电影", 12.99, "永久")
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headphone = PhysicalProduct("E001", "无线耳机", 89.99, 0.2)
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# 创建购物车
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cart = ShoppingCart()
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# 添加商品
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cart.add_item(book, 2)
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cart.add_item(movie)
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cart.add_item(headphone, 3)
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# 显示购物车
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cart.display_cart()
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# 测试移除商品
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print("移除一副耳机...")
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cart.remove_item(headphone)
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cart.display_cart()
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# 测试批量折扣
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print("添加10本书...")
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cart.add_item(book, 10)
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cart.display_cart()
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# 显示商品信息
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print("\n商品详细信息:")
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print(book.display_info())
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print(movie.display_info())
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print(f"耳机重量: {headphone.weight}kg")
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print(f"电影授权类型: {movie.license_type}") |