code: def _get_spades_circular_nodes(self, fastg):
          '''Returns set of names of nodes in SPAdes fastg file that are circular. Names will match those in spades fasta file'''
          seq_reader = pyfastaq.sequences.file_reader(fastg)
          names = set([x.id.rstrip(';') for x in seq_reader if ':' in x.id])
          found_fwd = set()
          found_rev = set()
          for name in names:
              l = name.split(':')
              if len(l) != 2:
                  continue
              if l[0] == l[1]:
                  if l[0][-1] == "'":
                      found_rev.add(l[0][:-1])
                  else:
                      found_fwd.add(l[0])
  
          return found_fwd.intersection(found_revf _get_spades_circular_nodes(self, fastg):
          '''Returns set of names of nodes in SPAdes fastg file that are circular. Names will match those in spades fasta file'''
          seq_reader = pyfastaq.sequences.file_reader(fastg)
          names = set([x.id.rstrip(';') for x in seq_reader if ':' in x.id])
          found_fwd = set()
          found_rev = set()
          for name in names:
              l = name.split(':')
              if len(l) != 2:
                  continue
              if l[0] == l[1]:
                  if l[0][-1] == "'":
                      found_rev.add(l[0][:-1])
                  else:
                      found_fwd.add(l[0])
  
          return found_fwd.intersection(found_rev)
docs: Returns set of names of nodes in SPAdes fastg file that are circular. Names will match those in spades fasta file