2019.5.16 课后练习。简易购物车程序

根据之前看过的知识点，以自己的思路先写出了一个程序，后续继续老师的操作再进行优化。

 1 salary = int(input("请输入您的工资（单位 元）:"))
 2 
 3 print("以下是可购清单：")
 4 
 5 shopping_list = ['','iphone','computer','book','apple_juice','bread','cake']#商品列表
 6 commodity_prices = [0,6000,7000,2,3,3,5] #商品价格列表
 7 already_buy = []#已经购买的商品列表
 8 
 9 print("1.",shopping_list[1],commodity_prices[1],"元")
10 print("2.",shopping_list[2],commodity_prices[2],"元")
11 print("3.",shopping_list[3],commodity_prices[3],"元")
12 print("4.",shopping_list[4],commodity_prices[4],"元")
13 print("5.",shopping_list[5],commodity_prices[5],"元")
14 print("6.",shopping_list[6],commodity_prices[6],"元")
15 
16 select = ""
17 while select != "quit":
18     select = input("购买您需要的宝贝至购物车，请输入数字（如需结算，输入 quit）：")
19     print()
20     if select == "1":
21         salary = salary - commodity_prices[1]
22         if salary < 0:
23             print("余额不足，",salary)
24             salary = salary + commodity_prices[1]
25         else:
26             print("已加入",shopping_list[1],"到你的购物车，当前余额：",salary)
27         already_buy.append(shopping_list[1])
28     elif select == "2":
29         salary = salary - commodity_prices[2]
30         if salary < 0:
31             print("余额不足，", salary)
32             salary = salary + commodity_prices[2]
33         else:
34             print("已加入", shopping_list[2], "到你的购物车，当前余额：", salary)
35         already_buy.append(shopping_list[2])
36     elif select == "3":
37         salary = salary - commodity_prices[3]
38         if salary < 0:
39             print("余额不足，", salary)
40             salary = salary + commodity_prices[3]
41         else:
42             print("已加入", shopping_list[3], "到你的购物车，当前余额：", salary)
43         already_buy.append(shopping_list[3])
44     elif select == "4":
45         salary = salary - commodity_prices[4]
46         if salary < 0:
47             print("余额不足，", salary)
48             salary = salary + commodity_prices[4]
49         else:
50             print("已加入", shopping_list[4], "到你的购物车，当前余额：", salary)
51         already_buy.append(shopping_list[4])
52     elif select == "5":
53         salary = salary - commodity_prices[5]
54         if salary < 0:
55             print("余额不足，", salary)
56             salary = salary + commodity_prices[5]
57         else:
58             print("已加入", shopping_list[5], "到你的购物车，当前余额：", salary)
59         already_buy.append(shopping_list[5])
60     elif select == "6":
61         salary = salary - commodity_prices[6]
62         if salary < 0:
63             print("余额不足，", salary)
64             salary = salary + commodity_prices[6]
65         else:
66             print("已加入", shopping_list[6], "到你的购物车，当前余额：", salary)
67         already_buy.append(shopping_list[6])
68 else:
69     print("您已购买以下商品：")
70     print(already_buy)
71     print("余额为：",salary)
72     print("谢谢惠顾，欢迎下次光临！")

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