code: def targets(self):
          
          logging.info('Performing analysis with {} targets folder'.format(self.analysistype))
          for sample in self.runmetadata:
              if sample.general.bestassemblyfile != 'NA':
                  sample[self.analysistype].targetpath = \
                      os.path.join(self.targetpath, 'genera', sample[self.analysistype].genus, '')
                  # There is a relatively strict databasing scheme necessary for the custom targets. Eventually,
                  # there will be a helper script to combine individual files into a properly formatted combined file
                  try:
                      sample[self.analysistype].mappingfile = glob('{}*.fa'
                                                                   .format(sample[self.analysistype].targetpath))[0]
                  # If the fasta file is missing, raise a custom error
                  except IndexError as e:
                      # noinspection PyPropertyAccess
                      e.args = ['Cannot find the combined fasta file in {}. Please note that the file must have a '
                                '.fasta extension'.format(sample[self.analysistype].targetpath)]
                      if os.path.isdir(sample[self.analysistype].targetpath):
                          raise
                      else:
                          sample.general.bestassemblyfile = 'NA'
docs: Using the data from the BLAST analyses, set the targets folder, and create the 'mapping file'. This is the
          genera-specific FASTA file that will be used for all the reference mapping; it replaces the 'bait file' in the
          code