#----------第三級選單，進入後，隨便輸入就會退出到第三級選單，是不是有點問題------------
data = {
    '北京':{
        "昌平":{
            "沙河":["oldboy","test"],
            "天通苑":["鏈家地產","我愛我家"]
        },
        "朝陽":{
            "望京":["賓士","陌陌"],
            "國貿":["CICC","HP"],
            "東直門":["Advent","飛信"],
        },
        "海淀":{},
    },
    '山東':{
        "德州":{},
        "青島":{},
        "濟南":{}
    },
    '廣東':{
        "東莞":{},
        "常熟":{},
        "佛山":{},
    },
}

exit_flag = False

while not exit_flag:
    for i in data:
        print(i)
    chioes = input('輸入一級選單名稱：')
    if chioes in data:
        while not exit_flag:
            for i2 in data[chioes]:
                print('\t',i2)
            chioes2 = input('請輸入二級選單：')
            if chioes2 in data[chioes]:
                while  not exit_flag:
                    for i3 in data[chioes][chioes2]:
                        print('\t\t',i3)
                    chioes3 = input('請輸入三級選單：')
                    if chioes3 in data[chioes][chioes2]:
                        for i4 in  data[chioes][chioes2][chioes3]:
                            print('\t\t\t',i4)
                        chioes4 = input('返回上一層請輸入b，退出請輸入q')
                        if chioes4 == 'b':
                            pass #佔位符沒有意思直接略過，執行if chioes3 in data[chioes][chioes2]
                        elif chioes4 == 'q':
                            exit_flag = True
                    if chioes3 == 'b' :
                        break
                    elif chioes3 == 'q':
                        exit_flag = True
            if chioes2 == 'b':
                break
            elif chioes2 == 'q':
                exit_flag = True
    if chioes == 'b':
         break