U #IGZã@s$dZddlmZmZmZdd„ZdS)z Commonly useful converters. é)Úabsolute_importÚdivisionÚprint_functioncs‡fdd„}|S)zø A converter that allows an attribute to be optional. An optional attribute is one which can be set to ``None``. :param callable converter: the converter that is used for non-``None`` values. .. versionadded:: 17.1.0 cs|dkr dSˆ|ƒS)N©)Úval©Ú converterrú/converters.pyÚoptional_convertersz$optional..optional_converterr)rr rrr Úoptionals r N)Ú__doc__Z __future__rrrr rrrr Ús