golden hour

/usr/lib/python3.9/site-packages/attr

File/Folder	Size	Actions
__init__.py	1.53 KB
__init__.pyi	12.68 KB
__pycache__	-
_compat.py	7.14 KB
_config.py	514 B
_funcs.py	12.77 KB
_make.py	86.24 KB
_next_gen.py	4.04 KB
_version_info.py	2.11 KB
_version_info.pyi	209 B
converters.py	2.16 KB
converters.pyi	380 B
exceptions.py	1.9 KB
exceptions.pyi	539 B
filters.py	1.07 KB
filters.pyi	214 B
py.typed	0 B
setters.py	1.4 KB
setters.pyi	567 B
validators.py	11.23 KB
validators.pyi	1.82 KB

Edit: converters.py

"""
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*.
    :param callable factory: A callable that takes not 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
    """
    if default is NOTHING and factory is None:
        raise TypeError("Must pass either `default` or `factory`.")

if default is not NOTHING and factory is not None:
        raise TypeError(
            "Must pass either `default` or `factory` but not both."
        )

if factory is not None:
        default = Factory(factory)

if isinstance(default, Factory):
        if default.takes_self:
            raise ValueError(
                "`takes_self` is not supported by default_if_none."
            )

def default_if_none_converter(val):
            if val is not None:
                return val

return default.factory()

else:

def default_if_none_converter(val):
            if val is not None:
                return val

return default

return default_if_none_converter