code: def read_peptide_file(in_peptfile):
      
      peptides = defaultdict()
      pept = None
      with open(in_peptfile, 'r') as peptfile:
          for line in peptfile:
              if line.startswith('>'):
                  pept = line.strip().lstrip('>')
                  peptides[pept] = ''
              else:
                  peptides[pept] = line.strip()
      return peptides
docs: Reads an input peptide fasta file into memory in the form of a dict of fasta record: sequence
  
      :param str in_peptfile: Path to a peptide fasta
      :return: Dict of fasta record: sequence
      :rtype: dict