Updates the set, removing elements found in others.

set. difference_update(iterable, ...)

iterable, ...

Required. Iterable or multiple iterables to be compared against the set.

None

O(len(t))

>>> s = {1, 2}
>>> s.difference_update([2, 3])
>>> s
set([1])
>>> s.difference_update([1, 2], [3, 4])
>>> s
set([])

#TODO