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0 # l=J4 Ap bѿ """ Commonly useful converters. """ from __future__ import absolute_import, division, print_function from ._make import NOTHING, Factory, pipe __all__ = [ "pipe", "optional", "default_if_none", ] 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`` values. .. versionadded:: 17.1.0 """ def optional_converter(val): if val is None: return None return converter(val) return optional_converter def default_if_none(default=NOTHING, factory=None): """ A converter that allows to replace ``None`` values by *default* or the result of *factory*. :param default: Value to be used if ``None`` is passed. Passing an instance of `attr.Factory` is supported, however the ``takes_self`` option is *not*