code: def get_lattice_type(self):
          
          n = self._space_group_data["number"]
          system = self.get_crystal_system()
          if n in [146, 148, 155, 160, 161, 166, 167]:
              return "rhombohedral"
          elif system == "trigonal":
              return "hexagonal"
          else:
              return system
docs: Get the lattice for the structure, e.g., (triclinic,
          orthorhombic, cubic, etc.).This is the same than the
          crystal system with the exception of the hexagonal/rhombohedral
          lattice
  
          Returns:
              (str): Lattice type for structure or None if type cannot be detected.