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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Current File : //opt/imunify360/venv/lib/python3.11/site-packages/attr/setters.py
# SPDX-License-Identifier: MIT

"""
Commonly used hooks for on_setattr.
"""


from . import _config
from .exceptions import FrozenAttributeError


def pipe(*setters):
    """
    Run all *setters* and return the return value of the last one.

    .. versionadded:: 20.1.0
    """

    def wrapped_pipe(instance, attrib, new_value):
        rv = new_value

        for setter in setters:
            rv = setter(instance, attrib, rv)

        return rv

    return wrapped_pipe


def frozen(_, __, ___):
    """
    Prevent an attribute to be modified.

    .. versionadded:: 20.1.0
    """
    raise FrozenAttributeError()


def validate(instance, attrib, new_value):
    """
    Run *attrib*'s validator on *new_value* if it has one.

    .. versionadded:: 20.1.0
    """
    if _config._run_validators is False:
        return new_value

    v = attrib.validator
    if not v:
        return new_value

    v(instance, attrib, new_value)

    return new_value


def convert(instance, attrib, new_value):
    """
    Run *attrib*'s converter -- if it has one --  on *new_value* and return the
    result.

    .. versionadded:: 20.1.0
    """
    c = attrib.converter
    if c:
        return c(new_value)

    return new_value


# Sentinel for disabling class-wide *on_setattr* hooks for certain attributes.
# autodata stopped working, so the docstring is inlined in the API docs.
NO_OP = object()

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