code: def get_coding_noncoding_transcript_ids(gtf):
      
      coding_gtf = partition_gtf(gtf, coding=True)
      coding_db = get_gtf_db(coding_gtf)
      coding_ids = set([x['transcript_id'][0] for x in coding_db.all_features()
                    if 'transcript_id' in x.attributes])
      noncoding_gtf = partition_gtf(gtf)
      noncoding_db = get_gtf_db(noncoding_gtf)
      noncoding_ids = set([x['transcript_id'][0] for x in noncoding_db.all_features()
                       if 'transcript_id' in x.attributes])
      return coding_ids, noncoding_ids
docs: return a set of coding and non-coding transcript_ids from a GTF