def root_indices(sec_list):
    """
    Returns the index of all sections without a parent.
    """
    roots = []
    for i,section in enumerate(sec_list):
        sref = h.SectionRef(sec=section)
        # has_parent returns a float... cast to bool
        if sref.has_parent() < 0.9:
            roots.append(i)
    return roots
Returns the index of all sections without a parent.