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 : //usr/lib/python3.6/site-packages/isc/keydict.py
############################################################################
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
############################################################################

from collections import defaultdict
from . import dnskey
import os
import glob


########################################################################
# Class keydict
########################################################################
class keydict:
    """ A dictionary of keys, indexed by name, algorithm, and key id """

    _keydict = defaultdict(lambda: defaultdict(dict))
    _defttl = None
    _missing = []

    def __init__(self, dp=None, **kwargs):
        self._defttl = kwargs.get('keyttl', None)
        zones = kwargs.get('zones', None)

        if not zones:
            path = kwargs.get('path',None) or '.'
            self.readall(path)
        else:
            for zone in zones:
                if 'path' in kwargs and kwargs['path'] is not None:
                    path = kwargs['path']
                else:
                    path = dp and dp.policy(zone).directory or '.'
                if not self.readone(path, zone):
                    self._missing.append(zone)

    def readall(self, path):
        files = glob.glob(os.path.join(path, '*.private'))

        for infile in files:
            key = dnskey(infile, path, self._defttl)
            self._keydict[key.name][key.alg][key.keyid] = key

    def readone(self, path, zone):
        if not zone.endswith('.'):
            zone += '.'
        match='K' + zone + '+*.private'
        files = glob.glob(os.path.join(path, match))

        found = False
        for infile in files:
            key = dnskey(infile, path, self._defttl)
            if key.fullname != zone: # shouldn't ever happen
                continue
            keyname=key.name if zone != '.' else '.'
            self._keydict[keyname][key.alg][key.keyid] = key
            found = True

        return found

    def __iter__(self):
        for zone, algorithms in self._keydict.items():
            for alg, keys in algorithms.items():
                for key in keys.values():
                    yield key

    def __getitem__(self, name):
        return self._keydict[name]

    def zones(self):
        return (self._keydict.keys())

    def algorithms(self, zone):
        return (self._keydict[zone].keys())

    def keys(self, zone, alg):
        return (self._keydict[zone][alg].keys())

    def missing(self):
        return (self._missing)

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