程序要求：
1.输入你的薪水
2.可以根据商品号选择商品
3.可以在每次购买后显示余额
1 shopping_list=[]
2 products_list=[
3 ("Ipone6" ,4000 ),
4 ("Mac pro",5000 ),
5 ("python book",80),
6 ("bike",1200),
7 ("coffee",20),
8 ("drink",10)
9 ]
10 salary=input("input your salary:")
11 if salary.isdigit():
12 salary=int(salary)
13 while True:
14 for index,item in enumerate (products_list ):
15 print(index,item)
16 choose_num=input("plese your choose...:")
17 if choose_num.isdigit():
18 choose_num=int(choose_num )
19 if choose_num<len(products_list) and choose_num >=0:
20 if salary>=products_list[choose_num][1]:
21 shopping_list.append(products_list[choose_num])
22 p=products_list[choose_num]
23 salary-=products_list[choose_num][1]
24 print("added \033[31;1m%s\033[0m into your shopcar...,your balance is \033[31;1m%s\033[0m" % (p,salary ))
25 else:
26 print("your salary can not afford it....")
27 else:
28 print("now,your choose is false....")
29 elif choose_num=="q":
30 for bought_products in shopping_list :
31 print (bought_products )
32 print("your balance is \033[31;1m%s\033[0m"%salary)
33 exit()
34 else:
35 print("your input is false....,plese input agin...")
