auto save

my_app.py

 import tkinter
+
 from tkinter import messagebox
 import json
 with open("user.txt","r",encoding="utf-8") as f:
@@ -133,4 +134,4 @@ class My_register():        # 注册窗口
         self.password2 = self.e3.get()
         return self.name, self.password1, self.password2
 app_login = My_login()
-app_login.show()
\ No newline at end of file
+app_login.show()