product_list = [

      ('Iphone',),

      ('Mac Pro',),

      ('Bike',),

      ('Watch',),

      ('Coffee',),

      ('python',),

 ]

 shooping_list = []

 salary = input("Input your salary:")

 if salary.isdigit():

     salary = int(salary)

     while True:

         #for item in product_list:

            # print(product_list.index(item),item)

         for index,item in enumerate(product_list): #下标，数据,enumerate取列表的下标

             print(index,item)

         user_choice = input("选择要买的商品：")

         if user_choice.isdigit():

             user_choice = int(user_choice)

             if user_choice < len(product_list) and user_choice >= :

                 p_item = product_list[user_choice]

                 if p_item[] <= salary: #买得起

                     shooping_list.append(p_item)

                     salary -= p_item[]

                     print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m"%(p_item,salary))

                 else:

                     print("\033[41;1m你的余额只剩[%s]啦，不能买了\033[0m"% salary)

             else:

                 print("product code [%s] is not exist!"% user_choice)

         elif user_choice == 'q':

             print("-----------shopping list-----------")

             for p in shooping_list:

                 print(p)

             print("Your current balance:",salary)

             exit()