any idea why this cell won't finish running?

fout = open('/home/ecwheele/data/analysis/clip/region_annotations_basic/basic_first_exons.bed','w')
for transcript in v19_basic_db.features_of_type('transcript'):
    reversers = transcript.strand == '-'
    for i, exon in enumerate(v19_basic_db.children(transcript, featuretype="exon")):
        if exon.strand == "+":
            if exon.start == transcript.start:
                line = '%s\t%s\t%s\t%s\t%s\t%s\n' % (exon.chrom,exon.start-1,exon.stop,exon.id,exon.score,exon.strand)
                fout.write(line)
            else:
                continue
        elif exon.strand == "-":
            if exon.stop == transcript.stop:
                line = '%s\t%s\t%s\t%s\t%s\t%s\n' % (exon.chrom,exon.start-1,exon.stop,exon.id,exon.score,exon.strand)
                fout.write(line)
            else:
                continue
            
fout.close