@classmethod<EOL><INDENT>def _create_indexer(cls, name, indexer):<DEDENT>
if getattr(cls, name, None) is None:<EOL><INDENT>_indexer = functools.partial(indexer, name)<EOL>setattr(cls, name, property(_indexer, doc=indexer.__doc__))<EOL><DEDENT>
Create an indexer like _name in the class.