code: def get_first_transcript_name(fasta_file):
      
      with open_pysam_file(fname=fasta_file, ftype='fasta') as f:
          transcript_name = f.references[0]
      return transcript_name
docs: Return the first FASTA sequence from the given FASTA file.
  
      Keyword arguments:
      fasta_file -- FASTA format file of the transcriptome