code: def get_structures(self, primitive=True):
          
          structures = []
          for d in self._cif.data.values():
              try:
                  s = self._get_structure(d, primitive)
                  if s:
                      structures.append(s)
              except (KeyError, ValueError) as exc:
                  # Warn the user (Errors should never pass silently)
                  # A user reported a problem with cif files produced by Avogadro
                  # in which the atomic coordinates are in Cartesian coords.
                  self.errors.append(str(exc))
                  warnings.warn(str(exc))
          if self.errors:
              warnings.warn("Issues encountered while parsing CIF:")
              for error in self.errors:
                  warnings.warn(error)
          if len(structures) == 0:
              raise ValueError("Invalid cif file with no structures!")
          return structures
docs: Return list of structures in CIF file. primitive boolean sets whether a
          conventional cell structure or primitive cell structure is returned.
  
          Args:
              primitive (bool): Set to False to return conventional unit cells.
                  Defaults to True. With magnetic CIF files, will return primitive
                  magnetic cell which may be larger than nuclear primitive cell.
  
          Returns:
              List of Structures.