auto save

my_app.py

 import tkinter
 import tkinter
 from tkinter import messagebox
 from tkinter import messagebox
 with open("user.txt","r",encoding="utf-8") as f:
 with open("user.txt","r",encoding="utf-8") as f:
-        info=f.read()
-        users=json.loads(info)
+    info=f.read()
+    users = json.loads(info)
 
 
 def login_to_reg():    # 登录界面转注册界面
 def login_to_reg():    # 登录界面转注册界面
     app_login.root.destroy()
     app_login.root.destroy()