Most of the people prefer to use python in software engineering coding interviews. But what about if someone is interviewing for iOS Engineer position?

1. Will it be the right choice/decision to use Swift if someone is comfortable in both Swift and Python? And if the job for which he is interviewing is iOS Software Engineer where Swift will be used as the main language.
2. What are the pros and cones of using Swift over Python in an interview at FANNG (for iOS Software Enginee Position)?