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converters.cpython-310.pyc
o ו`ß ã @ sn d Z ddlmZmZmZ ddlmZ ddlmZm Z m Z es&ddl Z ddl Z g d¢Z dd „ Zedfd d „ZdS ) z Commonly useful converters. é )Úabsolute_importÚdivisionÚprint_functioné )ÚPY2)ÚNOTHINGÚFactoryÚpipeN)r ÚoptionalÚdefault_if_nonec sœ ‡ fdd„}t sLd}zt ˆ ¡}W n ttfy Y nw |rLt|j ¡ ƒ}|r<|d jtj j ur<t j |d j |j d< |jtjj urLt j |j |j d< |S )aO A converter that allows an attribute to be optional. An optional attribute is one which can be set to ``None``. Type annotations will be inferred from the wrapped converter's, if it has any. :param callable converter: the converter that is used for non-``None`` values. .. versionadded:: 17.1.0 c s | d u rd S ˆ | ƒS ©N© ©Úval©Ú converterr ú1/usr/lib/python3/dist-packages/attr/converters.pyÚoptional_converter% s z$optional.<locals>.optional_converterNr r Úreturn)r ÚinspectZ signatureÚ ValueErrorÚ TypeErrorÚlistZ parametersÚvaluesÚ annotationZ ParameterÚemptyÚtypingZOptionalÚ__annotations__Zreturn_annotationZ Signature)r r ZsigÚparamsr r r r s& ÿ ÿ ÿr c sx ˆ t u r |du r tdƒ‚ˆ t ur|durtdƒ‚|dur t|ƒ‰ tˆ tƒr4ˆ jr,tdƒ‚‡ fdd„}|S ‡ fdd„}|S )aš 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 `attr.Factory` is supported, however the ``takes_self`` option is *not*. :param callable factory: A callable that takes no 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 `attr.Factory` is passed with ``takes_self=True``. .. versionadded:: 18.2.0 Nz(Must pass either `default` or `factory`.z5Must pass either `default` or `factory` but not both.z1`takes_self` is not supported by default_if_none.c s | d ur| S ˆ ¡ S r )Úfactoryr ©Údefaultr r Údefault_if_none_convertera s z2default_if_none.<locals>.default_if_none_converterc s | d ur| S ˆ S r r r r r r r" i s )r r r Ú isinstanceZ takes_selfr )r! r r" r r r r > s" ÿ ÿ úr )Ú__doc__Z __future__r r r Z_compatr Ú_maker r r r r Ú__all__r r r r r r Ú<module> s '