code: def _findSamesetProteins(protToPeps, proteins=None):
      
      proteins = viewkeys(protToPeps) if proteins is None else proteins
  
      equalEvidence = ddict(set)
      for protein in proteins:
          peptides = protToPeps[protein]
          equalEvidence[tuple(sorted(peptides))].add(protein)
      equalProteins = list()
      for proteins in viewvalues(equalEvidence):
          if len(proteins) > 1:
              equalProteins.append(tuple(sorted(proteins)))
      return equalProteins
docs: Find proteins that are mapped to an identical set of peptides.
  
      :param protToPeps: dict, for each protein (=key) contains a set of
          associated peptides (=value). For Example {protein: {peptide, ...}, ...}
      :param proteins: iterable, proteins that are tested for having equal
          evidence. If not specified all proteins are tested
      :returns: a list of sorted protein tuples that share equal peptide evidence