built in function for computing overlap in Python

Question

is there a built in function to compute the overlap between two discrete intervals, e.g. the overlap between [10, 15] and [20, 38]? In that case the overlap is 0. If it\'s

Answer 1

Just wrote this:

def overlap(interval1, interval2):
    """
    Given [0, 4] and [1, 10] returns [1, 4]
    """
    if interval2[0] <= interval1[0] <= interval2[1]:
        start = interval1[0]
    elif interval1[0] <= interval2[0] <= interval1[1]:
        start = interval2[0]
    else:
        raise Exception("Intervals are not overlapping")

    if interval2[0] <= interval1[1] <= interval2[1]:
        end = interval1[1]
    elif interval1[0] <= interval2[1] <= interval1[1]:
        end = interval2[1]
    else:
        raise Exception("Intervals are not overlapping")

    return (start, end)


def percentage_overlap(interval1, interval2):
    """
    Given [0, 4] and [1, 10] returns 0.75
    """
    try:
        overlap = _overlap(interval1, interval2)
    except Exception:
        return 0.0
    return (overlap[1] - overlap[0]) / (interval1[1] - interval1[0])