auto save

my_app.py

 import tkinter
+from tkinter import messagebox
+import json
+
+with open("user.txt","r",encoding="utf-8") as f:
+    info = f.read()
+    users = 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("请填写完整注册资料")
+    elif name in users:
+        messagebox.showwarning("用户名已存在")
+    elif password1!= password2:
+         messagebox.showwarning("两次密码不一致！")
+    else:
+        users[name] = password1
+        content = json.dumps(users)
+        with open("user.txt","w",encoding="utf-8") as f:
+            f.write(content)
+        messagebox.showinfo('cg',"注册成功！")
+ 
 
 def login():    # 登录验证
     pass    

user.txt

-{"admin": "123456"}
\ No newline at end of file
+{"admin": "123456", "tt": "123", "jingjing": "123", "272": "123", "a": "12", "w": "12"}
\ No newline at end of file