> return {e for (e, g) in self.sort_email.items()
> if g & groups_list}
>
guys i think ive got it. The & in that comprehension was really
confusing me, but i found out it means intersection, so i took the
sets manually and saw the results i got using intersection and it
became more clear from there. A Big Thanks if you took the time to
help solve my issues.