This question already has an answer here:
Near the end of Harry Potter and the Deathly Hallows:
Voldemort "kills" Harry, destroying the part of his own soul that was in Harry.
Dumbledore tells us before this that:
Part of Lord Voldemort lives inside Harry, and it is that which gives him the power of speech with snakes, and a connection with Lord Voldemort's mind that he has never understood.
Given the above, does that mean that Harry would have lost his ability to speak with snakes at the end of the book? Or would his own mind have learnt Parseltongue from the thing that gave it to him, so that when that thing was gone he would still know how to talk to snakes? I don't think any mention of this is made in the book, but I'm very curious to know. It would be a shame if Harry was no longer a Parselmouth.