shopping

#!/usr/bin/env python
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_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)
        break'''
        for index,item in enumerate(product_list):
            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 >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary:
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    #print("Added %s into shopping cart,your current balance is %s" %(p_item ,salary))
                    print("haha,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\033[0m" % salary)
            else:
                print("product code [%s] is not exist" % user_choice)
        elif user_choice == 'q':
            print("------------shopping list------------")
            for p in shopping_list:
                print(p)

            print("Your current balance:",salary)
            exit()
        else:
            print("invalid_option")