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　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。 . Prv8 Shell

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Current File : //lib/python3.6/site-packages/cloudinit/cmd/devel/parser.py

# Copyright (C) 2017 Canonical Ltd.
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Define 'devel' subcommand argument parsers to include in cloud-init cmd."""

import argparse

from cloudinit.cmd.devel import hotplug_hook, make_mime, net_convert, render


def get_parser(parser=None):
    if not parser:
        parser = argparse.ArgumentParser(
            prog="cloudinit-devel",
            description="Run development cloud-init tools",
        )
    subparsers = parser.add_subparsers(title="Subcommands", dest="subcommand")
    subparsers.required = True

    subcmds = [
        (
            hotplug_hook.NAME,
            hotplug_hook.__doc__,
            hotplug_hook.get_parser,
            hotplug_hook.handle_args,
        ),
        (
            net_convert.NAME,
            net_convert.__doc__,
            net_convert.get_parser,
            net_convert.handle_args,
        ),
        (render.NAME, render.__doc__, render.get_parser, render.handle_args),
        (
            make_mime.NAME,
            make_mime.__doc__,
            make_mime.get_parser,
            make_mime.handle_args,
        ),
    ]
    for (subcmd, helpmsg, get_parser, handler) in subcmds:
        parser = subparsers.add_parser(subcmd, help=helpmsg)
        get_parser(parser)
        parser.set_defaults(action=(subcmd, handler))

    return parser

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