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 : //usr/lib/python3.6/site-packages/setuptools/namespaces.py
import os
from distutils import log
import itertools

from setuptools.extern.six.moves import map


flatten = itertools.chain.from_iterable


class Installer:

    nspkg_ext = '-nspkg.pth'

    def install_namespaces(self):
        nsp = self._get_all_ns_packages()
        if not nsp:
            return
        filename, ext = os.path.splitext(self._get_target())
        filename += self.nspkg_ext
        self.outputs.append(filename)
        log.info("Installing %s", filename)
        lines = map(self._gen_nspkg_line, nsp)

        if self.dry_run:
            # always generate the lines, even in dry run
            list(lines)
            return

        with open(filename, 'wt') as f:
            f.writelines(lines)

    def uninstall_namespaces(self):
        filename, ext = os.path.splitext(self._get_target())
        filename += self.nspkg_ext
        if not os.path.exists(filename):
            return
        log.info("Removing %s", filename)
        os.remove(filename)

    def _get_target(self):
        return self.target

    _nspkg_tmpl = (
        "import sys, types, os",
        "has_mfs = sys.version_info > (3, 5)",
        "p = os.path.join(%(root)s, *%(pth)r)",
        "importlib = has_mfs and __import__('importlib.util')",
        "has_mfs and __import__('importlib.machinery')",
        "m = has_mfs and "
            "sys.modules.setdefault(%(pkg)r, "
                "importlib.util.module_from_spec("
                    "importlib.machinery.PathFinder.find_spec(%(pkg)r, "
                        "[os.path.dirname(p)])))",
        "m = m or "
            "sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))",
        "mp = (m or []) and m.__dict__.setdefault('__path__',[])",
        "(p not in mp) and mp.append(p)",
    )
    "lines for the namespace installer"

    _nspkg_tmpl_multi = (
        'm and setattr(sys.modules[%(parent)r], %(child)r, m)',
    )
    "additional line(s) when a parent package is indicated"

    def _get_root(self):
        return "sys._getframe(1).f_locals['sitedir']"

    def _gen_nspkg_line(self, pkg):
        # ensure pkg is not a unicode string under Python 2.7
        pkg = str(pkg)
        pth = tuple(pkg.split('.'))
        root = self._get_root()
        tmpl_lines = self._nspkg_tmpl
        parent, sep, child = pkg.rpartition('.')
        if parent:
            tmpl_lines += self._nspkg_tmpl_multi
        return ';'.join(tmpl_lines) % locals() + '\n'

    def _get_all_ns_packages(self):
        """Return sorted list of all package namespaces"""
        pkgs = self.distribution.namespace_packages or []
        return sorted(flatten(map(self._pkg_names, pkgs)))

    @staticmethod
    def _pkg_names(pkg):
        """
        Given a namespace package, yield the components of that
        package.

        >>> names = Installer._pkg_names('a.b.c')
        >>> set(names) == set(['a', 'a.b', 'a.b.c'])
        True
        """
        parts = pkg.split('.')
        while parts:
            yield '.'.join(parts)
            parts.pop()


class DevelopInstaller(Installer):
    def _get_root(self):
        return repr(str(self.egg_path))

    def _get_target(self):
        return self.egg_link

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