code: def set_aromatic(self):
          
          #XXX FIX ME
          # this probably shouldn't be here
          for atom in self.atoms:
              atom.aromatic = 1
              
          for bond in self.bonds:
              bond.aromatic = 1
              bond.bondorder = 1.5
              bond.bondtype = 4
              bond.symbol = ":"
              bond.fixed = 1
  
          self.aromatic = 1
docs: set the cycle to be an aromatic ring