parse insertion to gff format

def parse_insertion(insertion, gff):
    """
    parse insertion to gff format
    """
    offset = insertion['offset']
    for ins in parse_fasta(insertion['insertion sequence'].split('|')):
        strand = insertion['strand']
        ID = ins[0].split('>')[1].split()[0]
        Start, End = [int(i) for i in ins[0].split('gene-pos=', 1)[1].split()[0].split('-')]
        Start, End = abs(Start + offset), abs(End + offset)
        if strand == '-':
            Start, End = End, Start
        gff['#seqname'].append(insertion['ID'])
        gff['source'].append(insertion['source'])
        gff['feature'].append('IVS')
        gff['start'].append(Start)
        gff['end'].append(End)
        gff['score'].append('.')
        gff['strand'].append(strand) # same as rRNA
        gff['frame'].append('.')
        gff['attribute'].append('ID=%s' % (ID))
    return gff