1 shopping_list = [
 2     ("iphone",5800),
 3     ("Mac_Pro",12000),
 4     ("bike",1500),
 5     ("bed",800),
 6     ("cap",30),
 7 ]
 8 s_list=[]
 9 use_salary = input("Please input you Salary:")
10 
11 if use_salary.isdigit():                               # 如果用户输入的是数字
12     use_salary = int(use_salary)                       # 赋值为整形数字
13     while True:                                       # 如果输入数字为真 则进行循环
14         for index,item in enumerate(shopping_list,1):     # index（）表示数列中的位置，enumerate表示的就是数列中的下标
15             #print(shopping_list.index(item),item)
16             print(index,item)                           # index 就是下标，item 就是数列项
17         use_choice = input("What do you want ‘number‘,and Please input ‘q‘to exit:")
18 
19         if use_choice.isdigit():
20             use_choice = int(use_choice)           # 判断输入的是否为数字
21             if use_choice > -1 and use_choice < len(shopping_list):    # 如果取的数值在列表范围，才可以进行判断金额
22                 shoping_item = shopping_list[use_choice]        # 通过用户输入序号找到产品，而产品中包括名称和价格
23                 if shoping_item[1] <= use_salary:
24                     use_salary -= shoping_item[1]      # shoping_item 表示表中价格列
25                     s_list.append(shoping_item)
26                     print("Add %s in you cart,you current balance is \033[31;1m %s \033[0m." %(shoping_item,use_salary))
27                 else:
28                     print("You don‘t have enough money and you current balance is \033[31;1m%s\033[0m" %(use_salary))
29         elif use_choice == "q":
30             print("------ list ------")
31             for i in s_list:
32                print(i)
33             print("your current balance is %s"%use_salary)
34             exit()
35         else:
36             print("not exist...")