python 修行之路（一）（购物车练习）

#Author:Mr Lishopping_name = [                    ['Iphone',5800],                    ['surface',8000],                    ['huaweu',4000],                    ['meizu',2000]]shopping_list=[]salary = int(input('please input your salary '))while 1 :    print('please select your shopping\n')    for i in range(4):        print(shopping_name[i])        print('\n')    user = input("请选择商品：")    if user.isdigit():        user = int(user)        if user < len(shopping_name) and user >=0:            s_item = shopping_name[user]            if salary >= s_item[1]:                salary -= s_item[1]                shopping_list.append(s_item)                print('you have shopping_name[user]\n')            else:                print('shopping faild\n')                print("your banlance is %d yuan,还买个毛线啊\n"% salary)        else:            print('valid value\n')    if user == 'q':        print("your shopping list is:")        for a in shopping_list:            print(a)        exit()

以上是一个简单的购物程序，主要用到了列表的嵌套，变量的存储以及将字符型转换为int型等相关知识。上面shopping_name 利用了列表嵌套，列表嵌套中的内列表可以使用【】，

也可以使用（）。