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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 : //usr/lib64/python2.7/idlelib/PathBrowser.py

import os
import sys
import imp

from idlelib.TreeWidget import TreeItem
from idlelib.ClassBrowser import ClassBrowser, ModuleBrowserTreeItem
from idlelib.PyShell import PyShellFileList


class PathBrowser(ClassBrowser):

    def __init__(self, flist, _htest=False):
        """
        _htest - bool, change box location when running htest
        """
        self._htest = _htest
        self.init(flist)

    def settitle(self):
        "Set window titles."
        self.top.wm_title("Path Browser")
        self.top.wm_iconname("Path Browser")

    def rootnode(self):
        return PathBrowserTreeItem()

class PathBrowserTreeItem(TreeItem):

    def GetText(self):
        return "sys.path"

    def GetSubList(self):
        sublist = []
        for dir in sys.path:
            item = DirBrowserTreeItem(dir)
            sublist.append(item)
        return sublist

class DirBrowserTreeItem(TreeItem):

    def __init__(self, dir, packages=[]):
        self.dir = dir
        self.packages = packages

    def GetText(self):
        if not self.packages:
            return self.dir
        else:
            return self.packages[-1] + ": package"

    def GetSubList(self):
        try:
            names = os.listdir(self.dir or os.curdir)
        except os.error:
            return []
        packages = []
        for name in names:
            file = os.path.join(self.dir, name)
            if self.ispackagedir(file):
                nn = os.path.normcase(name)
                packages.append((nn, name, file))
        packages.sort()
        sublist = []
        for nn, name, file in packages:
            item = DirBrowserTreeItem(file, self.packages + [name])
            sublist.append(item)
        for nn, name in self.listmodules(names):
            item = ModuleBrowserTreeItem(os.path.join(self.dir, name))
            sublist.append(item)
        return sublist

    def ispackagedir(self, file):
        if not os.path.isdir(file):
            return False
        init = os.path.join(file, "__init__.py")
        return os.path.exists(init)

    def listmodules(self, allnames):
        modules = {}
        suffixes = imp.get_suffixes()
        sorted = []
        for suff, mode, flag in suffixes:
            i = -len(suff)
            for name in allnames[:]:
                normed_name = os.path.normcase(name)
                if normed_name[i:] == suff:
                    mod_name = name[:i]
                    if mod_name not in modules:
                        modules[mod_name] = None
                        sorted.append((normed_name, name))
                        allnames.remove(name)
        sorted.sort()
        return sorted

def _path_browser(parent):  # htest #
    flist = PyShellFileList(parent)
    PathBrowser(flist, _htest=True)
    parent.mainloop()

if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_pathbrowser', verbosity=2, exit=False)

    from idlelib.idle_test.htest import run
    run(_path_browser)

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