save project

diy2.py

@@ -6,5 +6,7 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
     if name != username:
-        print("")
+        print("用户名不存在，请重新输入!")
+    if password != userpassword:
+        print("密码输入有误，请重新输入！")    
 print("欢迎来到贝尔编程!")
\ No newline at end of file