三级菜单

Posted 2020-10-31 bugpudge

# _*_coding:utf-8_*_
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‘: {},
                ‘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‘: {},
}

#  城市级别
citylevel = menu.copy()
#  目录级别
menulevel = 0
#  目录级别存储集合
citylevelup = {}
#  循环
while True:
    #   输入起始城市
    for i in citylevel:
        print(i.center(10, ‘-‘))
    strinput = input(‘输入城市,退出输入exit‘).strip()
    #   如何输入的城市在列表中，将本目录的级别menulevel存入citylevelup{}
    if strinput in citylevel:
        print(strinput)
        citylevelup[menulevel] = citylevel.copy()  # 存储当前级别，索引+1
        citylevel = citylevel[strinput]
        menulevel += 1
        continue
    elif strinput == ‘exit‘:
        break
    #  如何输入back返回上一级，索引-1
    elif strinput == ‘back‘ and menulevel != 0:
        menulevel -= 1
        citylevel = citylevelup[menulevel]
    else:
        print(‘您输入的值不存在，请重新输入‘)
print(‘程序结束‘)