code: def construct_rest_of_world(self, excluded, name=None, fp=None, geom=True):
          
          for location in excluded:
              assert location in self.locations, "Can't find location {}".format(location)
          included = self.all_faces.difference(
              set().union(*[set(self.data[loc]) for loc in excluded])
          )
  
          if not geom:
              return included
          elif not gis:
              warn(MISSING_GIS)
              return
  
          geom = _union(included)[1]
          if fp:
              self.write_geoms_to_file(fp, [geom], [name] if name else None)
              return fp
          else:
              return geom
docs: Construct rest-of-world geometry and optionally write to filepath ``fp``.
  
          Excludes faces in location list ``excluded``. ``excluded`` must be an iterable of location strings (not face ids).