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()
+    uses=json.loads(info)
 
 def login_to_reg():    # 登录界面转注册界面
-    pass
+    app_login.root.destroy()   #关闭登记界面
+    global app_reg           #变量全局化
+    app_reg=My_register()    #创建注册界面
+    app_reg.show()           #显示注册界面
 
 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
-    pass
+    name,password1,password2=app_reg.get_input()
+    if name=="" or password1==""or password2=="":
+        messagebox.showwarning("警告","请填写完整的资料")
+    elif name in uses:
+        messagebox.showwarning("警告","用户已经存在")
+    elif password2 !=password1:
+        messagebox.showwarning("警告","两次密码不一致")
+    else:
+        uses[name]=password1
+        user =json.dumps(uses)
+       
 
 def login():    # 登录验证
     pass    

user.txt

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