晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# SPDX-License-Identifier: MIT

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

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 isinstance(cls, type)),
        frozenset(cls for cls in what if isinstance(cls, str)),
        frozenset(cls for cls in what if isinstance(cls, Attribute)),
    )


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

    :param what: What to include.
    :type what: `list` of classes `type`, field names `str` or
        `attrs.Attribute`\\ s

    :rtype: `callable`

    .. versionchanged:: 23.1.0 Accept strings with field names.
    """
    cls, names, attrs = _split_what(what)

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

    return include_


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

    :param what: What to exclude.
    :type what: `list` of classes `type`, field names `str` or
        `attrs.Attribute`\\ s.

    :rtype: `callable`

    .. versionchanged:: 23.3.0 Accept field name string as input argument
    """
    cls, names, attrs = _split_what(what)

    def exclude_(attribute, value):
        return not (
            value.__class__ in cls
            or attribute.name in names
            or attribute in attrs
        )

    return exclude_

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