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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.
Args:
converter (typing.Callable):
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*.
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
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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
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