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 password2=='' or password1=='':
+        messagebox.showwarning('警告','请填写完整的注册信息')
+    elif name in users:
+        messagebox.showwarning('错误','用户名已存在！')
+    elif password2!=password1:
+        messagebox.showwarning('错误','两次密码不一致')
+    else:
+        users[name]=password1
+        content=json.dumps(users)
+        with open('user.txt','w',encoding='utf-8') as file:
+            file.write(content)
+        messagebox.showinfo('成功','注册成功')
+        reg_to_login()
 def login():    # 登录验证
     pass    
 
@@ -103,5 +127,5 @@ 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=My_login()
 app_login.show()
\ No newline at end of file

user.txt

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