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//opt/alt/python38/lib/python3.8/site-packages/attr/filters.py

"""
Commonly useful filters for :func:`attr.asdict`.
"""

from __future__ import absolute_import, division, print_function

from ._compat import isclass
from ._make import Attribute

def _split_what(what):
    """
    Returns a tuple of `frozenset`s of classes and attributes.
    """
    return (
        frozenset(cls for cls in what if isclass(cls)),
        frozenset(cls for cls in what if isinstance(cls, Attribute)),
    )

def include(*what):
    """
    Whitelist *what*.

:param what: What to whitelist.
    :type what: :class:`list` of :class:`type` or :class:`attr.Attribute`\ s

:rtype: :class:`callable`
    """
    cls, attrs = _split_what(what)

def include_(attribute, value):
        return value.__class__ in cls or attribute in attrs

return include_

def exclude(*what):
    """
    Blacklist *what*.

:param what: What to blacklist.
    :type what: :class:`list` of classes or :class:`attr.Attribute`\ s.

:rtype: :class:`callable`
    """
    cls, attrs = _split_what(what)

def exclude_(attribute, value):
        return value.__class__ not in cls and attribute not in attrs

return exclude_