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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Directory :  /usr/lib/python3.6/site-packages/cloudinit/mergers/

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Current File : //usr/lib/python3.6/site-packages/cloudinit/mergers/m_dict.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.

DEF_MERGE_TYPE = "no_replace"
MERGE_TYPES = (
    "replace",
    DEF_MERGE_TYPE,
)


def _has_any(what, *keys):
    for k in keys:
        if k in what:
            return True
    return False


class Merger:
    def __init__(self, merger, opts):
        self._merger = merger
        # Affects merging behavior...
        self._method = DEF_MERGE_TYPE
        for m in MERGE_TYPES:
            if m in opts:
                self._method = m
                break
        # Affect how recursive merging is done on other primitives.
        self._recurse_str = "recurse_str" in opts
        self._recurse_array = _has_any(opts, "recurse_array", "recurse_list")
        self._allow_delete = "allow_delete" in opts
        # Backwards compat require this to be on.
        self._recurse_dict = True

    def __str__(self):
        s = (
            "DictMerger: (method=%s,recurse_str=%s,"
            "recurse_dict=%s,recurse_array=%s,allow_delete=%s)"
        )
        s = s % (
            self._method,
            self._recurse_str,
            self._recurse_dict,
            self._recurse_array,
            self._allow_delete,
        )
        return s

    def _do_dict_replace(self, value, merge_with, do_replace):
        def merge_same_key(old_v, new_v):
            if do_replace:
                return new_v
            if isinstance(new_v, (list, tuple)) and self._recurse_array:
                return self._merger.merge(old_v, new_v)
            if isinstance(new_v, str) and self._recurse_str:
                return self._merger.merge(old_v, new_v)
            if isinstance(new_v, (dict)) and self._recurse_dict:
                return self._merger.merge(old_v, new_v)
            # Otherwise leave it be...
            return old_v

        for (k, v) in merge_with.items():
            if k in value:
                if v is None and self._allow_delete:
                    value.pop(k)
                else:
                    value[k] = merge_same_key(value[k], v)
            else:
                value[k] = v
        return value

    def _on_dict(self, value, merge_with):
        if not isinstance(merge_with, (dict)):
            return value
        if self._method == "replace":
            merged = self._do_dict_replace(dict(value), merge_with, True)
        elif self._method == "no_replace":
            merged = self._do_dict_replace(dict(value), merge_with, False)
        else:
            raise NotImplementedError("Unknown merge type %s" % (self._method))
        return merged

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