code: def normalize_feature_objects(feature_objs):
      
      for obj in feature_objs:
          if hasattr(obj, "__geo_interface__") and \
             'type' in obj.__geo_interface__.keys() and \
             obj.__geo_interface__['type'] == 'Feature':
              yield obj.__geo_interface__
          elif isinstance(obj, dict) and 'type' in obj and \
                  obj['type'] == 'Feature':
              yield obj
          else:
              raise ValueError("Did not recognize object {0}"
                               "as GeoJSON Feature".format(obj))
docs: Takes an iterable of GeoJSON-like Feature mappings or
      an iterable of objects with a geo interface and
      normalizes it to the former.