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/hotshot/__init__.py
"""High-perfomance logging profiler, mostly written in C."""

import _hotshot
from _hotshot import ProfilerError

from warnings import warnpy3k as _warnpy3k
_warnpy3k("The 'hotshot' module is not supported in 3.x, "
          "use the 'profile' module instead.", stacklevel=2)

class Profile:
    def __init__(self, logfn, lineevents=0, linetimings=1):
        self.lineevents = lineevents and 1 or 0
        self.linetimings = (linetimings and lineevents) and 1 or 0
        self._prof = p = _hotshot.profiler(
            logfn, self.lineevents, self.linetimings)

        # Attempt to avoid confusing results caused by the presence of
        # Python wrappers around these functions, but only if we can
        # be sure the methods have not been overridden or extended.
        if self.__class__ is Profile:
            self.close = p.close
            self.start = p.start
            self.stop = p.stop
            self.addinfo = p.addinfo

    def close(self):
        """Close the logfile and terminate the profiler."""
        self._prof.close()

    def fileno(self):
        """Return the file descriptor of the profiler's log file."""
        return self._prof.fileno()

    def start(self):
        """Start the profiler."""
        self._prof.start()

    def stop(self):
        """Stop the profiler."""
        self._prof.stop()

    def addinfo(self, key, value):
        """Add an arbitrary labelled value to the profile log."""
        self._prof.addinfo(key, value)

    # These methods offer the same interface as the profile.Profile class,
    # but delegate most of the work to the C implementation underneath.

    def run(self, cmd):
        """Profile an exec-compatible string in the script
        environment.

        The globals from the __main__ module are used as both the
        globals and locals for the script.
        """
        import __main__
        dict = __main__.__dict__
        return self.runctx(cmd, dict, dict)

    def runctx(self, cmd, globals, locals):
        """Evaluate an exec-compatible string in a specific
        environment.

        The string is compiled before profiling begins.
        """
        code = compile(cmd, "<string>", "exec")
        self._prof.runcode(code, globals, locals)
        return self

    def runcall(self, func, *args, **kw):
        """Profile a single call of a callable.

        Additional positional and keyword arguments may be passed
        along; the result of the call is returned, and exceptions are
        allowed to propagate cleanly, while ensuring that profiling is
        disabled on the way out.
        """
        return self._prof.runcall(func, args, kw)

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