'Returns the union of \'self\' and \'other\'.
Examples
As a shortcut it is possible to use the \'+\' operator:
>>> from sympy import Interval, FiniteSet
>>> Interval(0, 1).union(Interval(2, 3))
Union(Interval(0, 1), Interval(2, 3))
>>> Interval(0, 1) + Interval(2, 3)
Union(Interval(0, 1), Interval(2, 3))
>>> Interval(1, 2, True, True) + FiniteSet(2, 3)
Union(Interval.Lopen(1, 2), {3})
Similarly it is possible to use the \'-\' operator for set differences:
>>> Interval(0, 2) - Interval(0, 1)
Interval.Lopen(1, 2)
>>> Interval(1, 3) - FiniteSet(2)
Union(Interval.Ropen(1, 2), Interval.Lopen(2, 3))'

def union(self, other):

    return Union(self, other)
