def reverse_complement_hsp_fragment(frag, query_length):
rev = SearchIO.HSPFragment(hit_id=frag.hit_id, query_id=frag.query_id)
rev.query_start = query_length - frag.query_end
rev.query_end = query_length - frag.query_start
rev.hit_start = frag.hit_start
rev.hit_end = frag.hit_end
if frag.hit_strand == -1:
rev.hit_strand = +1
elif frag.hit_strand == +1:
rev.hit_strand = -1
else:
#O or None,
rev.hit_strand = frag.hit_strand
return rev
