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 : //lib64/python3.6/site-packages/setools/diff/properties.py
# Copyright 2016, Tresys Technology, LLC
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools.  If not, see
# <http://www.gnu.org/licenses/>.
#
from collections import namedtuple

from .descriptors import DiffResultDescriptor
from .difference import Difference


modified_properties_record = namedtuple("modified_property", ["property", "added", "removed"])


class PropertiesDifference(Difference):

    """
    Determine the difference in policy properties
    (unknown permissions, MLS, etc.) between two policies.
    """

    modified_properties = DiffResultDescriptor("diff_properties")

    def diff_properties(self):
        self.modified_properties = []

        if self.left_policy.handle_unknown != self.right_policy.handle_unknown:
            self.modified_properties.append(
                modified_properties_record("handle_unknown",
                                           self.right_policy.handle_unknown,
                                           self.left_policy.handle_unknown))

        if self.left_policy.mls != self.right_policy.mls:
            self.modified_properties.append(
                modified_properties_record("MLS",
                                           self.right_policy.mls,
                                           self.left_policy.mls))

        if self.left_policy.version != self.right_policy.version:
            self.modified_properties.append(
                modified_properties_record("version",
                                           self.right_policy.version,
                                           self.left_policy.version))

    #
    # Internal functions
    #
    def _reset_diff(self):
        """Reset diff results on policy changes."""
        self.log.debug("Resetting property differences")
        self.modified_properties = None

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