python 自学 1 day

#!/usr/bin/env python
#coding = utf-8
age_of_oldby = 56
user = "fyt"
word = "fyt"

f = open("black_user.txt","r")
lock_file = f.read()
f.close()
count = 0

city_dct = {'北京':{'海淀区':['上地','西二旗','颐和园','五道口','六道口'],
                    '昌平区':['生命科学园','史各庄','朱辛庄','沙河','县城','北小营'],
                    '朝阳区':['国贸','双井','太阳宫','东直门','柳芳']}}

city_index = [(index,key) for index, key in  enumerate(city_dct)]
city_index.append((len(city_index),'退出'))

for i in range(3):
    username = input("请输入账号")
    password = input("请输入密码")

    if lock_file == username:
       print("您的账号已被锁定")
       break
    elif username==user and password==word:
        print("欢迎您")
    else:
        print("账号密码错误")
    count+=1
    if count==3:
        print("您的账号将被锁定")
        f = open("black_user.txt","w")
        f.write("%s" %username)
        f.close()

    while True:
        print("欢迎查询北京地图")
        print('------------------------------')
        for i in  city_index:
            for j in  i:
                print(j,end='')
            print('')

        get_city = input('请输入查询标号')
        if not get_city.isdigit():
            print('请输入一个数字索引号')
            continue
        elif int(get_city) >= len(city_index):
            print('输入的数字太大，请确认并输入')
            continue
        elif int(get_city) == len(city_index)-1:
            print('欢迎再登陆,bye bye!')
            break
        else:
            choose_city = city_index[int(get_city)][1]
            area_index = [(index,key) for index,key in enumerate(city_dct[choose_city])]
            area_index.append((len(area_index),'返回'))
            while True:
                for i in  area_index:
                    for j in i:
                        print(j,end='')
                    print('')
                get_area = input('请选择查询的索引号')
                if not get_area.isdigit():
                    print('请输入一个数字索引号')
                    continue
                elif int(get_area) >= len(area_index):
                    print('输入的数字太大，请重新输入')
                    continue
                elif int(get_area) == len(area_index)-1:
                    print('返回到上一级菜单')
                    break
                else:
                    choose_area = area_index[int(get_area)][1]
                    print(city_dct[choose_city][choose_area])
                    print('--------------------')
    else:
        quit()