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converters.cpython-310.pyc
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o ��`� � @ 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. � )�absolute_import�division�print_function� )�PY2)�NOTHING�Factory�pipeN)r �optional�default_if_nonec s� � fdd�}t sLd}zt�� �}W n ttfy Y nw |rLt|j�� �}|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 � | �S �N� ��val�� converterr �1/usr/lib/python3/dist-packages/attr/converters.py�optional_converter% s z$optional.<locals>.optional_converterNr r �return)r �inspect� signature� ValueError� TypeError�list� parameters�values� annotation� Parameter�empty�typing�Optional�__annotations__�return_annotation� Signature)r r �sig�paramsr r r r s& � � �r c sx � t u r |du r td��� t ur|durtd��|dur t|�� t� t�r4� jr,td��� fdd�}|S � fdd�}|S )a� 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 � � � S r )�factoryr ��defaultr r �default_if_none_convertera s z2default_if_none.<locals>.default_if_none_converterc s | d ur| S � S r r r r' r r r) i s )r r r � isinstance� takes_selfr )r( r& r) r r' r r > s" � � �r )�__doc__� __future__r r r �_compatr �_maker r r r r �__all__r r r r r r �<module> s '