E.1) A tuple is a sequence of immutable Python objects. It can hold mutable objects such as lists. Assignments are not allowed in tuples. Yes we can append to a tuple but the id of the tupple changes. We are not updating the tuple but creating a new tupple from an old tuple.
E.2) Yes we can append elements to a list in a tuple. No this does not contradict the previous part. That's because tuples don't contain lists, strings or numbers. They contain references to other objects. The inablity to change the sequence of references a tuple contains doesn't mean that you can't mutate the object associated with those references.
