save project

diy2.py

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