'The complement of \'self\' w.r.t the given the universe.
Examples
>>> from sympy import Interval, S
>>> Interval(0, 1).complement(S.Reals)
Union(Interval.open(-oo, 0), Interval.open(1, oo))
>>> Interval(0, 1).complement(S.UniversalSet)
UniversalSet() \ Interval(0, 1)'

def complement(self, universe):

    return Complement(universe, self)
