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/lib64/python2.7/Demo/comparisons/systemtest.py
#! /usr/bin/python2.7

# 3)  System Test
#
#     Given a list of directories, report any bogus symbolic links contained
#     anywhere in those subtrees.  A bogus symbolic link is one that cannot
#     be resolved because it points to a nonexistent or otherwise
#     unresolvable file.  Do *not* use an external find executable.
#     Directories may be very very deep.  Print a warning immediately if the
#     system you're running on doesn't support symbolic links.

# This implementation:
# - takes one optional argument, using the current directory as default
# - uses chdir to increase performance
# - sorts the names per directory
# - prints output lines of the form "path1 -> path2" as it goes
# - prints error messages about directories it can't list or chdir into

import os
import sys
from stat import *

def main():
    try:
        # Note: can't test for presence of lstat -- it's always there
        dummy = os.readlink
    except AttributeError:
        print "This system doesn't have symbolic links"
        sys.exit(0)
    if sys.argv[1:]:
        prefix = sys.argv[1]
    else:
        prefix = ''
    if prefix:
        os.chdir(prefix)
        if prefix[-1:] != '/': prefix = prefix + '/'
        reportboguslinks(prefix)
    else:
        reportboguslinks('')

def reportboguslinks(prefix):
    try:
        names = os.listdir('.')
    except os.error, msg:
        print "%s%s: can't list: %s" % (prefix, '.', msg)
        return
    names.sort()
    for name in names:
        if name == os.curdir or name == os.pardir:
            continue
        try:
            mode = os.lstat(name)[ST_MODE]
        except os.error:
            print "%s%s: can't stat: %s" % (prefix, name, msg)
            continue
        if S_ISLNK(mode):
            try:
                os.stat(name)
            except os.error:
                print "%s%s -> %s" % \
                      (prefix, name, os.readlink(name))
        elif S_ISDIR(mode):
            try:
                os.chdir(name)
            except os.error, msg:
                print "%s%s: can't chdir: %s" % \
                      (prefix, name, msg)
                continue
            try:
                reportboguslinks(prefix + name + '/')
            finally:
                os.chdir('..')

main()

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