1 #coding:utf-8
2
3 '''
4 购物车：
5 显示商品和购买价格。
6 购入商品，加入购物车。
7 付款，余额不足时提示，并可重新购买。
8 '''
9
10 shop_cart = []
11 amount = 0
12 wallet = 100
13 commodity = {"大米":60,"香蕉":8,"饼干":12,"榴莲":17}
14
15 print("商品名称:\t金额(元):")
16 for k,v in commodity.items():
17 print("%s\t\t%s"%(k,v))
18
19 while True:
20 print("\n结账请输入[B]，重新购买请输入[R]，退出请输入[Q]")
21 shop = input("请输入购买商品名称:")
22 if isinstance(shop,str):
23 if shop == "Q":
24 print("\nGoodbye Baby!!")
25 break
26 if shop == "R":
27 print("\nI am back. baby!!")
28 continue
29 elif shop == "B":
30 for i in shop_cart:
31 amount += commodity[i]
32 if wallet < amount:
33 print("\n余额不足！！\n供需付款 %s (元)，\n剩余金额 %s (元)"%(amount,wallet))
34 else:
35 wallet -= amount
36 for i in shop_cart:
37 print("%s %s (元)" % (i, commodity[i]))
38 print("=================\n账单：%s (元)"%amount)
39 print("余额 %s (元)"%wallet)
40 elif shop in commodity.keys():
41 shop_cart.append(shop)
42 print("\n购物车：")
43 for n in shop_cart:
44 print("----------\n%s\t%s (元)"%(n,commodity[n]))
45 else:
46 print("\n输入有误，请输入需要购买商品的名称！！！\n")
47 else:
48 print("\n输入有误，请输入需要购买商品的名称！！！\n")
