ó i€ \c@`sTdZddlmZmZmZddlmZmZd„Zedd„Z dS(s Commonly useful converters. i(tabsolute_importtdivisiontprint_functioni(tNOTHINGtFactoryc`s‡fd†}|S(s÷ 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(sD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pytoptional_converters ((RR((RsD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pytoptional s c`sµˆtkr'|dkr'tdƒ‚nˆtk rN|dk rNtdƒ‚n|dk rit|ƒ‰ntˆtƒr˘ˆjrtdƒ‚n‡fd†}n‡fd†}|S(sİ A converter that allows to replace ``None`` values by *default* or the result of *factory*. :param default: Value to be used if ``None`` is passed. Passing an instance of :class:`attr.Factory` is supported, however the ``takes_self`` option is *not*. :param callable factory: A callable that takes not parameters whose result is used if ``None`` is passed. :raises TypeError: If **neither** *default* or *factory* is passed. :raises TypeError: If **both** *default* and *factory* are passed. :raises ValueError: If an instance of :class:`attr.Factory` is passed with ``takes_self=True``. .. versionadded:: 18.2.0 s(Must pass either `default` or `factory`.s5Must pass either `default` or `factory` but not both.s1`takes_self` is not supported by default_if_none.c`s|dk r|SˆjƒS(N(Rtfactory(R(tdefault(sD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pytdefault_if_none_converter@s c`s|dk r|SˆS(N(R(R(R (sD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pyR Hs N(RRt TypeErrorRt isinstancet takes_selft ValueError(R R R ((R sD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pytdefault_if_nones    N( t__doc__t __future__RRRt_makeRRR RR(((sD/data/av2000/b2b/venv/lib/python2.7/site-packages/attr/converters.pyts