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
     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
     app_reg.root.destroy()
     global app_login
     app_login = My_login()
     app_login.show()
-def register():     # 注册验证
-    pass
 
+def register():     # 注册验证
+    name, password1, password2 = app_reg.get_input()
+    if name == '' or password1 == '' or password2 == '':
+        messagebox.showwarning('警告', '请填写完整的注册资料')
+    elif name in users:
+        messagebox.showwarning('错误', '用户名已经存在!')
+    elif password1 != password2:
+        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)
 def login():    # 登录验证
     pass    
 

user.txt

-{"admin": "123456"}
\ No newline at end of file
+{"admin": "123456", "\u53d1\u7684\u89c4\u5212": "\u5bf9\u65b9\u8fc7\u540e", "\u53d1\u7684\u5bf9\u65b9\u8fc7\u540e": "\u5bf9\u65b9\u8fc7\u540e", "\u4f4e\u529f\u8017": "\u5bf9\u65b9\u8fc7\u540e"}
\ No newline at end of file