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 : //lib/python3.6/site-packages/cloudinit/distros/parsers/hostname.py
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

from io import StringIO

from cloudinit.distros.parsers import chop_comment


# Parser that knows how to work with /etc/hostname format
class HostnameConf:
    def __init__(self, text):
        self._text = text
        self._contents = None

    def parse(self):
        if self._contents is None:
            self._contents = self._parse(self._text)

    def __str__(self):
        self.parse()
        contents = StringIO()
        for (line_type, components) in self._contents:
            if line_type == "blank":
                contents.write("%s\n" % (components[0]))
            elif line_type == "all_comment":
                contents.write("%s\n" % (components[0]))
            elif line_type == "hostname":
                (hostname, tail) = components
                contents.write("%s%s\n" % (hostname, tail))
        # Ensure trailing newline
        contents = contents.getvalue()
        if not contents.endswith("\n"):
            contents += "\n"
        return contents

    @property
    def hostname(self):
        self.parse()
        for (line_type, components) in self._contents:
            if line_type == "hostname":
                return components[0]
        return None

    def set_hostname(self, your_hostname):
        your_hostname = your_hostname.strip()
        if not your_hostname:
            return
        self.parse()
        replaced = False
        for (line_type, components) in self._contents:
            if line_type == "hostname":
                components[0] = str(your_hostname)
                replaced = True
        if not replaced:
            self._contents.append(("hostname", [str(your_hostname), ""]))

    def _parse(self, contents):
        entries = []
        hostnames_found = set()
        for line in contents.splitlines():
            if not len(line.strip()):
                entries.append(("blank", [line]))
                continue
            (head, tail) = chop_comment(line.strip(), "#")
            if not len(head):
                entries.append(("all_comment", [line]))
                continue
            entries.append(("hostname", [head, tail]))
            hostnames_found.add(head)
        if len(hostnames_found) > 1:
            raise IOError("Multiple hostnames (%s) found!" % (hostnames_found))
        return entries

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