pathon作业：字典、列表、字符串应用实例－打印三级菜单小程序

打印省市县三级菜单，输入‘q’退出程序，否则循环执行。

'''
application of dictionary,list,and string
'''
dic = {'Jilin province':{'Songyuan':['Fuyu','Qianguo'],
                         'Baicheng':['Daan','Taonan']},
       'LiaoNin Province':{'Shenyang':['A','B'],
                           'Dalian':['C','D']},
       'Heilongjiang Province':{'Haerbin':['E','F'],
                                'Mudanjiang':['G','H']}
       }

while True:
    print("province name".center(50, '-'))
    province_name = []
    for i in dic:
        print(i)
        province_name.append(i)
    choice = input("input your choice:")
    province_index_name = province_name[int(choice)]
    print("city name".center(50,'-'))
    city_name = []
    for j in dic[province_index_name]:
        print(j)
        city_name.append(j)
    choice = input("please input your choice:")
    city_index_name = city_name[int(choice)]
    print("county name".center(50,'-'))
    for k in dic[province_index_name][city_index_name]:
        print(k)
    selection = input("q/quit or return to the list")
    if selection == 'q':
        exit("bye-bye")