auto save

my_app.py

 import tkinter
 import tkinter
+import json
+from tkinter import messagebox
+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
 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
 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
 def register():     # 注册验证
-    pass
+    name,password1,password2=app_reg.get_input()
+    if name=="" or password1=="" or password2=="":
+        messagebox.showwarning("警告","资料填写不完整！")
+    elif name in users:
+        messagebox.showerror("错误","用户名已经存在!")
+    elif password1 != password2:
+        messagebox.showerror("错误","两次密码不一致!") 
 
 
 def login():    # 登录验证
 def login():    # 登录验证
     pass    
     pass    
@@ -91,7 +108,7 @@ class My_register():        # 注册窗口
         button1 = tkinter.Button(self.root, text='提交', bg="lightblue",
         button1 = tkinter.Button(self.root, text='提交', bg="lightblue",
                   width=15,command=register)
                   width=15,command=register)
         button1.place(x=230, y=250)
         button1.place(x=230, y=250)
-        button1 = tkinter.Button(self.root, text='取消', bg="lightgreen",
+        button1 = tkinter.Button(self.root, text='退出', bg="lightgreen",
                   width=15, command=reg_to_login)
                   width=15, command=reg_to_login)
         button1.place(x=80, y=250)
         button1.place(x=80, y=250)
         # 进入消息循环
         # 进入消息循环