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Edit File: converters.cpython-37.pyc

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Commonly useful converters.
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    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
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    A converter that allows to replace ``None`` values by *default* or the
    result of *factory*.

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       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
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