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converters.cpython-39.pyc
a ���g � @ sZ d Z ddlZddlmZ ddlmZmZmZmZ g d�Z dd� Z edfd d �Z d d � Z dS ) z Commonly useful converters. � N� )�_AnnotationExtractor)�NOTHING� Converter�Factory�pipe)�default_if_none�optionalr �to_boolc s� t � t�r� fdd�}n � fdd�}t� �}|�� }|rHtj| |jd< |�� }|rdtj| |jd< t � t�r|t|ddd�S |S )a_ 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. Args: converter (typing.Callable): the converter that is used for non-`None` values. .. versionadded:: 17.1.0 c s | d u r d S � | ||�S �N� )�val�inst�field�� converterr �@/opt/nydus/tmp/pip-target-mke_irhy/lib/python/attr/converters.py�optional_converter& s z$optional.<locals>.optional_converterc s | d u r d S � | �S r r �r r r r r - s r �returnT)� takes_selfZ takes_field)� isinstancer r Zget_first_param_type�typing�Optional�__annotations__Zget_return_type)r r Zxtr�t�rtr r r r s r c s� � t u r |du r d}t|��� t ur8|dur8d}t|��|durHt|�� t� t�rr� jrdd}t|��� fdd�}n � fdd�}|S )a� A converter that allows to replace `None` values by *default* or the result of *factory*. Args: default: Value to be used if `None` is passed. Passing an instance of `attrs.Factory` is supported, however the ``takes_self`` option is *not*. factory (typing.Callable): A callable that takes no parameters whose result is used if `None` is passed. Raises: TypeError: If **neither** *default* or *factory* is passed. TypeError: If **both** *default* and *factory* are passed. ValueError: If an instance of `attrs.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_converterl s z2default_if_none.<locals>.default_if_none_converterc s | d ur | S � S r r r r r r r t s )r � TypeErrorr r r � ValueError)r r �msgr r r r r B s r c C s@ t | t�r| �� } | dv r dS | dv r*dS d| ��}t|��dS )a� Convert "boolean" strings (for example, from environment variables) to real booleans. Values mapping to `True`: - ``True`` - ``"true"`` / ``"t"`` - ``"yes"`` / ``"y"`` - ``"on"`` - ``"1"`` - ``1`` Values mapping to `False`: - ``False`` - ``"false"`` / ``"f"`` - ``"no"`` / ``"n"`` - ``"off"`` - ``"0"`` - ``0`` Raises: ValueError: For any other value. .. versionadded:: 21.3.0 )T�truer �yes�y�on�1r T)F�false�f�no�n�off�0r Fz Cannot convert value to bool: N)r �str�lowerr" )r r# r r r r } s r ) �__doc__r Z_compatr �_maker r r r �__all__r r r r r r r �<module> s -;