save project

diy1.py

@@ -8,7 +8,10 @@ while True:
     if username == name and userpassword == password:
         print("登陆成功!")
         break
-    print("输入错误!")
+    if name != username:
+        print("用户名不存在或错误！")
+    if userpassword != password:
+        print("密码错误，请重新输入！")
 print("欢迎来到贝尔编程")