import json

def op_data(filename,dic=None):

    if dic:#写入进去

        with open(filename,'w',encoding='utf-8') as fw:

            json.dump(dic,fw,ensure_ascii=False,indent=4) #indent代码缩进几位

    else:

        with open(filename,encoding='utf-8') as fr:

            return json.load(fr)

FILE_NAME = 'user_info.json'

all_users = op_data(FILE_NAME)

for i in range(3):

    choice = input('输入，1注册，2、删除')

    if choice=='':

        username = input('usenrame:')

        pwd = input('pwd:')

        if username not in all_users:

            all_users[username]=pwd

            op_data(FILE_NAME,all_users)

    elif choice=="":

        username = input('usenrame:')

        all_users.pop(username)

        op_data(FILE_NAME, all_users)