三级菜单和购物车

# __*__ coding: utf-8 __*__
__author__ = "david.z"

menu = {
    ‘北京‘:{
        ‘海淀‘:{
            ‘五道口‘:{
                ‘soho‘:{},
                ‘网易‘:{},
                ‘google‘:{}
            },
            ‘中关村‘:{
                ‘爱奇艺‘:{},
                ‘汽车之家‘:{},
                ‘youku‘:{},
            },
            ‘上地‘:{
                ‘百度‘:{},
            },
        },
        ‘昌平‘:{
            ‘沙河‘:{
                ‘老男孩‘:{
                    ‘路飞‘:{
                ‘Python‘:{
                }}
                },
                ‘北航‘:{},
            },
            ‘天通苑‘:{},
            ‘回龙观‘:{},
        },
        ‘朝阳‘:{},
        ‘东城‘:{},
    },
    ‘上海‘:{
        ‘闵行‘:{
            "人民广场":{
                ‘炸鸡店‘:{}
            }
        },
        ‘闸北‘:{
            ‘火车战‘:{
                ‘携程‘:{}
            }
        },
        ‘浦东‘:{},
    },
    ‘山东‘:{},
}


currert_layer = menu
layers = []  #进入下一层的都添加一次进来

while True:
    for i in currert_layer:
        print(i)
    choice = input("进入程序:").strip()
    if not choice:continue #如果没有选择也继续

    if choice in currert_layer:
        layers.append(currert_layer) #进入下一层之前append上一层进入layers列表
        currert_layer = currert_layer[choice]
    elif choice == ‘b‘ or choice ==‘B‘:
        if len(layers) != 0:
            currert_layer = layers.pop() #把上一层添加进layers的删除掉
        else:
            print("已经在初始画面！")
    elif choice == ‘q‘ or choice ==‘Q‘:
        print("程序结束！")
        exit()

# __*__ coding: utf-8 __*__
__author__ = "david.z"
import os
def gouwuche():
    products = [
        ("苹果X", 6888),
        ("MacPro", 14800),
        ("小米6", 2499),
        ("星巴克咖啡", 31),
        ("Python书籍", 80),
        ("Nike 鞋子 ", 799),
        ("儿童车", 1355)
    ]

    shopping_list = []

    salary = input("请输入您的工资:")
    while True:
        if salary.isdigit():
            salary = int(salary)
            while True:
                for index, item in enumerate(products):
                    print(index, item)
                    # print()
                user_choice = input("请选择你要购买的商品编号：")
                if user_choice.isdigit():
                    user_choice = int(user_choice)
                    if user_choice < len(products) and user_choice >= 0:
                        p_item = products[user_choice]
                        if p_item[1] <= salary:  # 买得起
                            shopping_list.append(p_item)
                            salary -= p_item[1]
                            print("您所购买的商品为\033[32;1m%s\033[0m,您的余额还剩\033[31;1m%s\033[0m" % (p_item, salary))
                        else:
                            print("\033[41;1m您的余额仅剩%s,请尽快充值！！\033[0m" % salary)
                    else:
                        print("您选择的【%s】不存在！！！" % user_choice)
                elif user_choice == "q" or user_choice == "Q":
                    print (‘shopping list‘.center(50, ‘-‘))
                    for p in shopping_list:
                        print (p)
                    print("您的余额为：", salary)
                    exit()
                else:
                    print("您的输入有误!")

            else:
                print ("您的输入有误，请重新输入！！")
            break

input_users = []
count = 0
while count < 3:
    count += 1
    username = input("Username:").strip()
    password = input("Password:").strip()
    input_users.append(username) #把第一次输入的用户名 加入到列表里
    account_file = "db/%s"%username

    if os.path.isfile(account_file):
        f = open(account_file,‘r‘)
        account = eval(f.read())#加载账号数据到内存并且把字符串转成列表
        if username == account[0] and password == account[1]:
            if account[2] == 0: #账号激活状态
                print("欢迎来到无人超市".center(50,‘-‘))
                gouwuche()
            else:
                exit("账号 %s 被锁定。 "%username)
        else:
            print("错误的账号或密码，你还可以输入%s次。"%(3-count))
    else:
        print("您输入的用户不存在！")
else:
    if input_users.count(input_users[0]) == 3:#代表3次错误用户名一致，可以锁定
        account[2] = 1 #锁定状态

        f = open("db/%s"%input_users[0],‘w‘)
        f.write(str(account))
        f.close()
        print ("账户%s已经锁定。程序即将退出。"%account[0])