Case-insensitive comparison of sets in Python

Question

I have two sets (although I can do lists, or whatever):

a = frozenset((\'Today\',\'I\',\'am\',\'fine\'))
b = frozenset((\'hello\',\'how\',\'are\',\'you\',\'t         


        

Answer 1

>>> a_, b_ = map(set, [map(str.lower, a), map(str.lower, b)])
>>> a_ & b_
set(['today'])

Or... with less maps,

>>> a_ = set(map(str.lower, a))
>>> b_ = set(map(str.lower, b))
>>> a_ & b_
set(['today'])