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/cryptography/exceptions.py
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

from enum import Enum


class _Reasons(Enum):
    BACKEND_MISSING_INTERFACE = 0
    UNSUPPORTED_HASH = 1
    UNSUPPORTED_CIPHER = 2
    UNSUPPORTED_PADDING = 3
    UNSUPPORTED_MGF = 4
    UNSUPPORTED_PUBLIC_KEY_ALGORITHM = 5
    UNSUPPORTED_ELLIPTIC_CURVE = 6
    UNSUPPORTED_SERIALIZATION = 7
    UNSUPPORTED_X509 = 8
    UNSUPPORTED_EXCHANGE_ALGORITHM = 9
    UNSUPPORTED_DIFFIE_HELLMAN = 10
    UNSUPPORTED_MAC = 11


class UnsupportedAlgorithm(Exception):
    def __init__(self, message, reason=None):
        super(UnsupportedAlgorithm, self).__init__(message)
        self._reason = reason


class AlreadyFinalized(Exception):
    pass


class AlreadyUpdated(Exception):
    pass


class NotYetFinalized(Exception):
    pass


class InvalidTag(Exception):
    pass


class InvalidSignature(Exception):
    pass


class InternalError(Exception):
    def __init__(self, msg, err_code):
        super(InternalError, self).__init__(msg)
        self.err_code = err_code


class InvalidKey(Exception):
    pass

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