def METHOD_NAME(section):
    """Tortuosity of a section.
    The tortuosity is defined as the ratio of the path length of a section
    and the euclidian distnce between its end points.
    The path length is the sum of distances between consecutive points.
    If the section contains less than 2 points, the value 1 is returned.
    """
    pts = section.points
    return 1 if len(pts) < 2 else mm.section_length(pts) / mm.point_dist(pts[-1], pts[0])