一个小练习day2

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Icing

"""多级菜单
三级菜单
可依次选择进入各子菜单
知识点：列表、字典
"""
# 初始化城市信息
city_dict = {'广州': {'天河': ['天河体育馆', '金山大夏'],
                    '越秀': ['越秀公园', '光孝寺'],
                    '番禺': ['长隆欢乐世界', '大夫山']},
             '深圳': {'福田': ['莲花山', '赛格'],
                    '龙华': ['元山公园', '龙城广场'],
                    '南山': ['世界之窗', '欢乐谷']},
             '佛山': {'禅城': ['梁园', '孔庙'],
                    '南海': ['千灯湖', '南国桃园'],
                    '顺德': ['清晖园', '西山庙']}
             }
exit_flag =False

while not exit_flag:
    for i in city_dict:
        print(i)
    choice = input("选择进入1>>>")
    if choice in city_dict:
        while not exit_flag:
            for i2 in city_dict[choice]:
                print('\t',i2)
            choice2 = input("选择进入2>>>")
            if choice2 in city_dict[choice]:
                while not exit_flag:
                    for i3 in city_dict[choice][choice2]:
                        print('\t\t\t',i3)
                    choice3 = input("选择进入3>>>")
                    if choice3 in city_dict[choice][choice2]:
                        for i4 in city_dict[choice][choice2]:
                            print('\t\t\t',i4)
                        choice4 = input("最后一层，按b返回>>>")
                        if choice4 == 'b':
                            break
                        elif choice4 =='q':
                            exit_flag = True
                    if choice3 == 'b':
                        break
                    elif choice3 == 'q':
                        exit_flag = True
            if choice2 == 'b':
                break
            elif choice2 == 'q':
                exit_flag = True