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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# dialects/__init__.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

__all__ = (
    "firebird",
    "mssql",
    "mysql",
    "oracle",
    "postgresql",
    "sqlite",
    "sybase",
)

from .. import util


_translates = {"postgres": "postgresql"}


def _auto_fn(name):
    """default dialect importer.

    plugs into the :class:`.PluginLoader`
    as a first-hit system.

    """
    if "." in name:
        dialect, driver = name.split(".")
    else:
        dialect = name
        driver = "base"

    if dialect in _translates:
        translated = _translates[dialect]
        util.warn_deprecated(
            "The '%s' dialect name has been "
            "renamed to '%s'" % (dialect, translated)
        )
        dialect = translated
    try:
        if dialect == "firebird":
            try:
                module = __import__("sqlalchemy_firebird")
            except ImportError:
                module = __import__("sqlalchemy.dialects.firebird").dialects
                module = getattr(module, dialect)
        elif dialect == "sybase":
            try:
                module = __import__("sqlalchemy_sybase")
            except ImportError:
                module = __import__("sqlalchemy.dialects.sybase").dialects
                module = getattr(module, dialect)
        else:
            module = __import__("sqlalchemy.dialects.%s" % (dialect,)).dialects
            module = getattr(module, dialect)
    except ImportError:
        return None

    if hasattr(module, driver):
        module = getattr(module, driver)
        return lambda: module.dialect
    else:
        return None


registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)

plugins = util.PluginLoader("sqlalchemy.plugins")