auto save

my_app.py

 import tkinter
 from tkinter import messagebox
+import json
 
 with open("user.txt","r",encoding="utf-8") as file:
-        info = f.read()
+        info = file.read()
         users = json.loads(info)
 
 def login_to_reg():    # 登录界面转注册界面
@@ -29,7 +30,7 @@ def register():     # 注册验证
         users[name] = password1
         content = json.dumps(users)
         with open("user.txt","w",encoding="utf-8") as file:
-        file.wirte(content)
+            file.wirte(content)
     messagebox.showinfo("成功","注册成功")
     reg_to_login()
 def login():    # 登录验证