Convert a Union object to a list of intervals

Question

How can I convert a Union object in Sympy to a list of sub intervals?

E.g. convert this:

(-oo, a] U [b, oo)

to this:

[(-oo,a], [b,oo)]

Answer 1

In [1]: var("a, b")
Out[1]: (a, b)

In [2]: u = Union(Interval(-oo, a), Interval(b, oo))

In [3]: u
Out[3]: (-∞, a] ∪ [b, ∞)

In [4]: u.args
Out[4]: ((-∞, a], [b, ∞))

Note: if b < a, then the interval union is (-∞, ∞)