def check_strands(hsp_objs, fwd_strand):
    """Return True if hsps in the list are not all on the same strand.
    """
    hsps_on_different_strands = False
    for hsp in hsp_objs:
        x = True
        if hsp.hit_frame < 0:
            x = False
        if x != fwd_strand:
            hsps_on_different_strands = True

    return hsps_on_different_strands