小实验1：购物车记录

     
 1 shopping_list = [
    ("iphone",5800),
    ("Mac_Pro",12000),
    ("bike",1500),
    ("bed",800),
    ("cap",30),
]
s_list=[]
use_salary = input("Please input you Salary:")

if use_salary.isdigit():                               # 如果用户输入的是数字
    use_salary = int(use_salary)                       # 赋值为整形数字
    while True:                                       # 如果输入数字为真 则进行循环
        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
            #print(shopping_list.index(item),item)
            print(index,item)                           # index 就是下标，item 就是数列项
        use_choice = input("What do you want 'number',and Please input 'q'to exit:")

        if use_choice.isdigit():
            use_choice = int(use_choice)           # 判断输入的是否为数字
            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
                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
                if shoping_item[1] <= use_salary:
                    use_salary -= shoping_item[1]      # shoping_item 表示表中价格列
                    s_list.append(shoping_item)
                    print("Add %s in you cart,you current balance is \033[31;1m %s \033[0m." %(shoping_item,use_salary))
                else:
                    print("You don't have enough money and you current balance is \033[31;1m%s\033[0m" %(use_salary))
        elif use_choice == "q":
            print("------ list ------")
            for i in s_list:
               print(i)
            print("your current balance is %s"%use_salary)
            exit()
        else:
            print("not exist...")

自己之前构思了一个，不过不如这个清晰，还是要多写些，多联系，培养思路很重要...

Keep going ！