def manhattan_distance(point_a, point_b):
    """
    return Manhattan distance between to points

    :param point_a:
    :param point_b:
    :return: Manhattan distance between to points
    """
    x1, y1 = point_a
    x2, y2 = point_b
    return float(abs(x1 - x2) + abs(y1 - y2))
