docs: def best_assemblyfile(self):
          """
          Determine whether the contigs.fasta output file from the assembler is present. If not, set the .bestassembly
          attribute to 'NA'
          """
          for sample in self.metadata:
              try:
                  # Set the name of the filtered assembly file
                  filtered_outputfile = os.path.join(self.path, 'raw_assemblies', '{}.fasta'.format(sample.name))
                  # Set the name of the unfiltered spades assembly output file
                  if os.path.isfile(sample.general.assemblyfile):
                      size = os.path.getsize(sample.general.assemblyfile)
                      # Ensure that the assembly isn't just an empty file
                      if size == 0:
                          sample.general.bestassemblyfile = 'NA'
                      else:
                          sample.general.bestassemblyfile = sample.general.assemblyfile
                          shutil.copyfile(sample.general.bestassemblyfile, filtered_outputfile)
                  else:
                      sample.general.bestassemblyfile = 'NA'
                  # Add the name and path of the filtered file to the metadata
                  sample.general.filteredfile = filtered_outputfile
              except AttributeError:
                  sample.general.assemblyfile = 'NA'
                  sample.general.bestassemblyfile = 'NA'