auto save

1.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():  
     app_login.root.destroy()
     global app_reg
@@ -16,6 +21,8 @@ def register():     # 注册验证
     name,a,a1=app_reg.get_input()
     if name=="" or a=="" or a1=="":
         messagebox.showwarning("警告","请输入完整信息")
+    elif name in users:
+        messagebox.showwarning("警告","用户名已存在")
 def login():    # 登录验证
     pass    
 

user.test.py

+("张三"：123)
\ No newline at end of file

user.txt

+{"张三"：123}
\ No newline at end of file