How to create the union of many sets using a generator expression?

Question

Suppose I have a list of sets and I want to get the union over all sets in that list. Is there any way to do this using a generator expression? In other words, how can I cre

Answer 1

Nested generator expression. But I think they are a bit cryptic, so the way KennyTM suggested may be clearer.

frozenset(some_item for some_set in some_sets for some_item in some_set)