1-2 三级菜单

定义 database = {}

打印主菜单

用户输入选择  
   
    打印二级菜单
    
    用户输入
        
        打印三级菜单
        

每层输入q 退出程序

每层输入b返回上一层 （没有实现 ）

data_base = {
    ‘shaanxi‘:{
        "xi‘an":{
            ‘yantaqu‘:[‘dongyilu‘,‘dianzierlu‘,‘taibailu‘],
            ‘weiyangqu‘:[‘ziwulu‘,‘dahualu‘],
            ‘changanqu‘:[‘changanlu‘,‘jinhualu‘]
        },
        ‘xianyang‘:{},
        ‘weinan‘:{}
    },
    ‘jiangsu‘:{},
    ‘nanjing‘:{}
}

#循环打印字典，第一层
for i in data_base:
    print(i)

choice_1 = input("enter your choice >").strip()

if choice_1 in data_base:
    for i in data_base[choice_1]:
        print(‘ >‘,i)
    choice_2 = input("enter your choice >>").strip()

    if choice_2 in data_base[choice_1]:
        for i in data_base[choice_1][choice_2]:
            print(‘     >>‘,i)

        choice_3 = input("enter your choice >>>").strip()

        if choice_3 in data_base[choice_1][choice_2]:
            print(‘         >>>‘,data_base[choice_1][choice_2][choice_3])

        elif choice_3 == ‘q‘:
            print("-------bye-bye------")
            exit()
        else:
            print("\033[1mEntererror！！！\033[0m")

    elif choice_2 == ‘q‘:
            print("---------bye-bye------")
            exit()
    else:
        print("\033[1mEntererror！！！\033[0m")
elif choice_1 == ‘q‘:
            print("------bye-bye--------")
            exit()
else:
    print("\033[1mEntererror！！！\033[0m")

#打印完整字典
#print(data_base)

#print(data_base[choice_1])  #打印第一层
#print(data_base[choice_1][choice_2])　　#打印第2层
# print(data_base[choice_1][choice_2][choice_3]　　#打印第3层

#循环打印字典，第一层
# for i in data_base:
#     print(i)

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print("\033[1mEntererror！！！\033[0m")