文件json

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)
    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=='1':
        username=input('username:')
        pwd=input('pwd:')
        if username not in all_users:
            all_users[username]=pwd
            op_data(FILE_NAME,all_users)
    elif choice == '2':
        username = input('username:')
        all_users.pop(username)
        op_data(FILE_NAME,all_users)