code: def transcribe(records, transcribe):
      
      logging.info('Applying _transcribe generator: '
                   'operation to perform is ' + transcribe + '.')
      for record in records:
          sequence = str(record.seq)
          description = record.description
          name = record.id
          if transcribe == 'dna2rna':
              dna = Seq(sequence, IUPAC.ambiguous_dna)
              rna = dna.transcribe()
              yield SeqRecord(rna, id=name, description=description)
          elif transcribe == 'rna2dna':
              rna = Seq(sequence, IUPAC.ambiguous_rna)
              dna = rna.back_transcribe()
              yield SeqRecord(dna, id=name, description=description)
docs: Perform transcription or back-transcription.
      transcribe must be one of the following:
          dna2rna
          rna2dna