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 : //proc/thread-self/root/lib/python3.6/site-packages/cloudinit/mergers/m_list.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 = "replace"
MERGE_TYPES = ("append", "prepend", DEF_MERGE_TYPE, "no_replace")


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 = _has_any(opts, "recurse_str")
        self._recurse_dict = _has_any(opts, "recurse_dict")
        self._recurse_array = _has_any(opts, "recurse_array", "recurse_list")

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

    def _on_tuple(self, value, merge_with):
        return tuple(self._on_list(list(value), merge_with))

    def _on_list(self, value, merge_with):
        if self._method == "replace" and not isinstance(
            merge_with, (tuple, list)
        ):
            return merge_with

        # Ok we now know that what we are merging with is a list or tuple.
        merged_list = []
        if self._method == "prepend":
            merged_list.extend(merge_with)
            merged_list.extend(value)
            return merged_list
        elif self._method == "append":
            merged_list.extend(value)
            merged_list.extend(merge_with)
            return merged_list

        def merge_same_index(old_v, new_v):
            if self._method == "no_replace":
                # Leave it be...
                return old_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)
            return new_v

        # Ok now we are replacing same indexes
        merged_list.extend(value)
        common_len = min(len(merged_list), len(merge_with))
        for i in range(0, common_len):
            merged_list[i] = merge_same_index(merged_list[i], merge_with[i])
        return merged_list

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