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。 sh-3ll

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# schema.py
# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""Compatibility namespace for sqlalchemy.sql.schema and related.

"""

from .sql.base import SchemaVisitor  # noqa
from .sql.ddl import _CreateDropBase  # noqa
from .sql.ddl import _DDLCompiles  # noqa
from .sql.ddl import _DropView  # noqa
from .sql.ddl import AddConstraint  # noqa
from .sql.ddl import CreateColumn  # noqa
from .sql.ddl import CreateIndex  # noqa
from .sql.ddl import CreateSchema  # noqa
from .sql.ddl import CreateSequence  # noqa
from .sql.ddl import CreateTable  # noqa
from .sql.ddl import DDL  # noqa
from .sql.ddl import DDLBase  # noqa
from .sql.ddl import DDLElement  # noqa
from .sql.ddl import DropColumnComment  # noqa
from .sql.ddl import DropConstraint  # noqa
from .sql.ddl import DropIndex  # noqa
from .sql.ddl import DropSchema  # noqa
from .sql.ddl import DropSequence  # noqa
from .sql.ddl import DropTable  # noqa
from .sql.ddl import DropTableComment  # noqa
from .sql.ddl import SetColumnComment  # noqa
from .sql.ddl import SetTableComment  # noqa
from .sql.ddl import sort_tables  # noqa
from .sql.ddl import sort_tables_and_constraints  # noqa
from .sql.naming import conv  # noqa
from .sql.schema import _get_table_key  # noqa
from .sql.schema import BLANK_SCHEMA  # noqa
from .sql.schema import CheckConstraint  # noqa
from .sql.schema import Column  # noqa
from .sql.schema import ColumnCollectionConstraint  # noqa
from .sql.schema import ColumnCollectionMixin  # noqa
from .sql.schema import ColumnDefault  # noqa
from .sql.schema import Computed  # noqa
from .sql.schema import Constraint  # noqa
from .sql.schema import DefaultClause  # noqa
from .sql.schema import DefaultGenerator  # noqa
from .sql.schema import FetchedValue  # noqa
from .sql.schema import ForeignKey  # noqa
from .sql.schema import ForeignKeyConstraint  # noqa
from .sql.schema import IdentityOptions  # noqa
from .sql.schema import Index  # noqa
from .sql.schema import MetaData  # noqa
from .sql.schema import PassiveDefault  # noqa
from .sql.schema import PrimaryKeyConstraint  # noqa
from .sql.schema import SchemaItem  # noqa
from .sql.schema import Sequence  # noqa
from .sql.schema import Table  # noqa
from .sql.schema import ThreadLocalMetaData  # noqa
from .sql.schema import UniqueConstraint  # noqa