save project

diy2.py

@@ -6,5 +6,8 @@ while True:
     if name==username and password == userpassword:
         print("登录成功")
         break
-    print("用户名和密码错误")
+    if name!=username:
+        print("用户名错误")
+    if password!=userpassword:
+        print("密码错误")
 print("欢迎来到YL宇宙")