blob: 3b3bac92be524a260ed6312c9ac6360503a65814 [file] [log] [blame]
Commonly useful converters.
from __future__ import absolute_import, division, print_function
def optional(converter):
A converter that allows an attribute to be optional. An optional attribute
is one which can be set to ``None``.
:param callable converter: the converter that is used for non-``None``
.. versionadded:: 17.1.0
def optional_converter(val):
if val is None:
return None
return converter(val)
return optional_converter