python实现电子产品商店

 # 商品类 class Goods(object): def __init__(self,name,price,stock): self.id = 0 self.name = name self.price = price self.stock = stock # 当打印对象时，输出的内容 def __str__(self): return 'id:%s\n' \ '名称:%s\n' \ '价格:%s\n' \ '库存:%s\n' % (self.id,self.name,self.price, self.stock) if __name__ == '__main__': goods = Goods('Apple pods',2999,100) print(goods) goods2 = Goods('Apple Watch',3666,100) print(goods2) 

 from goods import Goods class CartItem(object): # 购物车商品 def __init__(self,goods,count): self.goods = goods self.count = count def __str__(self): # %f是小数类型的占位符 return '%s(￥%.2f)*%s' % (self.goods.name, self.goods.price,self.count) # 计算商品小计 def amout(self): return self.goods.price * self.count if __name__ == '__main__': goods = Goods('Apple pods',2999,100) # 创建购物车商品对象，需要传入一个商品对象 item = CartItem(goods,2) money = item.amout() print(money) 

 from goods import Goods from cart import CartItem class Shop(object): """商店""" def __init__(self): # 存储所有商品 self.shops = [] # 存储购物车商品 self.cart = [] # 加载商品 self.load() def load(self): """加载商品""" self.add(Goods('Apple Watch', 3299, 100)) self.add(Goods('AirPods', 1288, 100)) self.add(Goods('Home Pod', 1299, 100)) self.add(Goods('iPhone X', 6288, 100)) def add(self, good): """ 设置新商品的id，添加到列表中 :param good: 新商品 :return: None """ good.id = len(self.shops) + 1 self.shops.append(good) def print_line(self): print('-'*50) def print_double_line(self): print('='*50) def list(self): """列出所有商品""" print('请选择商品：') self.print_double_line() # 遍历商品列表 for g in self.shops: print('%s %s %s' % (g.id, g.name, g.price)) self.print_line() def list_cart(self): """展示购物车商品，计算总价""" self.print_line() total = 0.0 for item in self.cart: print('%s =￥%s' % (item, item.amout())) total += item.amout() self.print_line() print('总金额：￥%.2f' % total) def add_to_cart(self): """添加商品到购物车""" print('\n') g_id = input('请输入商品Id（回车去结账，0清空购物车）：') if len(g_id) == 0: # 结账 total = 0.0 for item in self.cart: total += item.amout() self.print_line() print('请支付：￥%.2f' % total) # 清空购物车 self.cart.clear() print('支付成功！') elif g_id == '0': self.cart.clear() print('购物车已清空！') else: # 计算商品索引 idx = int(g_id) - 1 # 取出商品 goods = self.shops[idx] self.print_line() print(goods) count = int(input('请输入购买数量：')) # 判断数量是否大于库存量 while count > goods.stock: count = int(input('没有这么多商品，请重新输入：')) # 如果商品已经在购物车中，修改商品数量 # 变量表示在购物车中是否有这个商品 is_exsts = False for item in self.cart: if item.goods == goods: # 说明在购物车中有该商品 is_exsts = True item.count += count # 减少库存 goods.stock -= count # 如果执行到这，is_exsts的值还是False，说明购物车中没有该商品 if is_exsts == False: # 把商品添加到购物车 goods.stock -= count self.cart.append(CartItem(goods, count)) # 展示购物车商品，计算总价 self.list_cart() def run(self): """运行应用程序""" print('智游电子产品商店') print('v1.0') print('\n') self.list() while True: self.add_to_cart() shop = Shop() shop.run()