auto save

my_app.py

 import tkinter
+import json
+from tkinter import messagebox
+
+with open('user.txt','r',encoding='utf-8') as f:
+    info = f.read()
+    users1 = json.loads(info)
 
 def login_to_reg():    # 登录界面转注册界面
-    pass
+    app_login.root.destroy()
+    global app_reg
+    app_reg = My_register()
+    app_reg.show()
 
 def reg_to_login():   # 注册界面转登录界面
-    pass
+    app_reg.root.destroy()
+    global app_login
+    app_login = My_login()
+    app_login.show()    
 
 def register():     # 注册验证
-    pass
+    name,password1,password2 =app_reg.get_input()
+    if name =='' or password1=='' or password2=='':
+        messagebox.showwarning('警告','请填写完整的注册信息')
+    elif name in users:
+        messagebox.showwarning('错误','用户名已经存在！')
+    elif password1 != password2:
+        messagebox.showwarning('错误','两次密码不一致！')
+    else:
+        users1[name] = password1
+        with open('user.txt','w',encoding='utf-8') as f:
+            info = f.write()
+            users = json.loads(info)
 
 def login():    # 登录验证
     pass    

user.txt

-{"admin": "123456"}
\ No newline at end of file