python之简单购物车练习

salary = input("please input the whole price:")
if salary.isdigit():   #判断输入的是否为数字
    salary = int (salary)
product_list = [       #定义商品
    ["book",50],
    ["telephone",2000],
    ["clothes",899],
    ["glass",399]
]
shopping_list = []    #已买商品
while True:
    for item in product_list:        #打印所有商品
        print(product_list.index(item)+1,item)

    user_choice = input("please choose commodities you want to buy")

    if user_choice.isdigit():      #判断输入是否为数字
       user_choice = int(user_choice)
       if user_choice <= len(product_list) and user_choice >0:    #判断是否在可选择的商品范围内
           p_item = product_list[user_choice - 1]            #选择对应序号的商品
           if salary >= p_item[1]:      #判断价钱是否足够
               shopping_list.append(p_item)      #将已经购买的商品添加到已买商品中
               salary -= p_item[1]         #价格对应减少
               print("%s has added the shopping cart,your current salary is \033[31;1m%s\033[0m" %(p_item[0],salary))
           else:
               print("\033[31;1myour current salary is not enough to pay,it noly have %s\033[0m" %(salary))
       else:
           print("your choice is not in.")
    elif user_choice == "q":       #输出为q,打印已购商品内容以及所剩钱数
         print("-------shopping list---------")
         for i in shopping_list:
             print(shopping_list.index(i)+1,i)
         print("your current balance is",salary)
         exit()
    else:
        print("please input correct number")