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()
+    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('警告，请输入完整的信息')
+    elif name in users:
+        messagebox.showwarning('错误，用户已存在')
+    elif password1 != password2:
+        messagebox.showwarning('错误，输入密码不一致')
+    else:
+        users[name] = password1
 def login():    # 登录验证
     pass