Source: 📖 Effective Python item 36

itertools.filterfalse

This function executes a negative filter—it includes all results outside of the filter criteria:

values = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
evens = lambda x: x % 2 == 0
filter_false = itertools.filterfalse(evens, values)

print(list(filter_false))

>>>
[1, 3, 5, 7, 9]