from bx.intervals.intersection import Interval, IntervalTree

tree = IntervalTree()

tree.insert(5, 7, 'foo')
tree.insert(9, 12, 'bar')

tree.find(6, 8)

tree.before(14)

tree.before_interval(Interval(14, 16))

tree.after(4)

tree.after_interval(Interval(2, 4))