I think python is the most efficient language to use in interviews tbh. Functional languages might be better depending on the problem but you don't want people thinking you're a witch or something.
That being said, Scala makes design questions much easier thanks to its type system.
I have noticed some colleges have been teaching more to the interview, so their grads can crush some problems in Python but fail when you ask them to implement a helper they were using. I am not talking about implementing a heap either, I am talking about merging objects.