save project

diy2.py

@@ -6,5 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
+    elif username != name:
+        print("账号错误:")
+    elif userpassword !=password :
+        print("密码错误:")    
     print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")