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Dir : ~/var/opt/nydus/ops/attr/__pycache__/

Edit File: converters.cpython-39.pyc

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    A converter that allows an attribute to be optional. An optional attribute
    is one which can be set to `None`.

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    any.

Args:
        converter (typing.Callable):
            the converter that is used for non-`None` values.

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    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����
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    Convert "boolean" strings (for example, from environment variables) to real
    booleans.

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    - ``"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
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