還是有不行的地方，先記錄一下，往下學習在繼續完善。

china = {'遼寧省':{'瀋陽':['和平區','太原街','中街'],
                    '大連':['甘井子','瓦房店','金州區'],
                    '朝陽':['朝陽縣','凌源','北票']},
         '吉林省':{'蛟河':['新農','天北鎮','前進鄉'],
                    '吉林':['永吉縣','豐滿區','龍潭區'],
                    '長春':['朝陽區','綠園區','寬城區']},
         }

 
import time
province = []
city = []
info = True
while info:
    print("".center(13,"="),"歡迎使用","".center(13,"="))
    print("".center(36,"="))
    for key, value in enumerate(china.keys(),1):
        print(key,value)
        province.append(value)
    print("退出請按q")
    print("".center(36,"="))

    number1 
 
= input("please entry your number:")
    print("".center(36, "="))
    if number1 == 'q' or number1 == 'Q':
        exit()
    if number1.isdigit():
        number1 = int(number1)

        if number1 <= len(province) and number1 > 0 :
            for key,value in enumerate(china[province[number1 - 1]].keys(),1):
                
 
print(key,value)
                city.append(value)
            print("退出請按q或Q","返回上一級請按b或B")
            print("".center(36, "="))

            number2 = input("please entry your number:")
            print("".center(36, "="))
            if number2 == 'q' or number2 == 'Q':
                info = False
            elif number2 == 'b' or number2 == 'B':
                del province[:]
                del city[:]


            elif number2.isdigit():
                number2 = int(number2)
                if number2 <= len(city) and number2 > 0 :
                    while info:
                        for name in china[province[number1 - 1]][city[number2 - 1]]:
                            print(name)
                        print("退出請按q或Q","返回上一級請按b或B")
                        print("".center(36, "="))
                        number3 = input("please entry your number:")
                        if number3 == 'q' or number3 == 'Q':
                            info = False

                        elif number3 == 'b' or number3 == 'B':
                            del city[:]
                            
                            
            else:
                print("輸入錯誤！！")
                time.sleep(1)
    else:
        print("輸入錯誤!!")
        time.sleep(3)