save project

sb.py

@@ -6,6 +6,7 @@ while True:
     if name == username and userpassword == pwd:
         print("登陆成功")
         break
-    print("用户名和密码错误！请重新输入")   
+        if name !=username and password !=userpassword:
+               print("用户名和密码错误！请重新输入")   
 print("欢迎来到贝尔编程")