ó 9(Zc@`s/dZddlmZmZmZd„ZdS(s Commonly useful converters. i(tabsolute_importtdivisiontprint_functionc`s‡fd†}|S(sø 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 c`s|dkrdSˆ|ƒS(N(tNone(tval(t converter(s./tmp/pip-build-wDUJoH/attrs/attr/converters.pytoptional_converters ((RR((Rs./tmp/pip-build-wDUJoH/attrs/attr/converters.pytoptionals N(t__doc__t __future__RRRR(((s./tmp/pip-build-wDUJoH/attrs/attr/converters.pyts