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) 2005-2025 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php

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

"""

from __future__ import annotations

from .sql.base import SchemaVisitor as SchemaVisitor
from .sql.ddl import _CreateDropBase as _CreateDropBase
from .sql.ddl import _DropView as _DropView
from .sql.ddl import AddConstraint as AddConstraint
from .sql.ddl import BaseDDLElement as BaseDDLElement
from .sql.ddl import CreateColumn as CreateColumn
from .sql.ddl import CreateIndex as CreateIndex
from .sql.ddl import CreateSchema as CreateSchema
from .sql.ddl import CreateSequence as CreateSequence
from .sql.ddl import CreateTable as CreateTable
from .sql.ddl import DDL as DDL
from .sql.ddl import DDLElement as DDLElement
from .sql.ddl import DropColumnComment as DropColumnComment
from .sql.ddl import DropConstraint as DropConstraint
from .sql.ddl import DropConstraintComment as DropConstraintComment
from .sql.ddl import DropIndex as DropIndex
from .sql.ddl import DropSchema as DropSchema
from .sql.ddl import DropSequence as DropSequence
from .sql.ddl import DropTable as DropTable
from .sql.ddl import DropTableComment as DropTableComment
from .sql.ddl import ExecutableDDLElement as ExecutableDDLElement
from .sql.ddl import InvokeDDLBase as InvokeDDLBase
from .sql.ddl import SetColumnComment as SetColumnComment
from .sql.ddl import SetConstraintComment as SetConstraintComment
from .sql.ddl import SetTableComment as SetTableComment
from .sql.ddl import sort_tables as sort_tables
from .sql.ddl import (
    sort_tables_and_constraints as sort_tables_and_constraints,
)
from .sql.naming import conv as conv
from .sql.schema import _get_table_key as _get_table_key
from .sql.schema import BLANK_SCHEMA as BLANK_SCHEMA
from .sql.schema import CheckConstraint as CheckConstraint
from .sql.schema import Column as Column
from .sql.schema import (
    ColumnCollectionConstraint as ColumnCollectionConstraint,
)
from .sql.schema import ColumnCollectionMixin as ColumnCollectionMixin
from .sql.schema import ColumnDefault as ColumnDefault
from .sql.schema import Computed as Computed
from .sql.schema import Constraint as Constraint
from .sql.schema import DefaultClause as DefaultClause
from .sql.schema import DefaultGenerator as DefaultGenerator
from .sql.schema import FetchedValue as FetchedValue
from .sql.schema import ForeignKey as ForeignKey
from .sql.schema import ForeignKeyConstraint as ForeignKeyConstraint
from .sql.schema import HasConditionalDDL as HasConditionalDDL
from .sql.schema import Identity as Identity
from .sql.schema import Index as Index
from .sql.schema import insert_sentinel as insert_sentinel
from .sql.schema import MetaData as MetaData
from .sql.schema import PrimaryKeyConstraint as PrimaryKeyConstraint
from .sql.schema import SchemaConst as SchemaConst
from .sql.schema import SchemaItem as SchemaItem
from .sql.schema import Sequence as Sequence
from .sql.schema import Table as Table
from .sql.schema import UniqueConstraint as UniqueConstraint