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/pexpect/_async.py
import asyncio
import errno

from pexpect import EOF

@asyncio.coroutine
def expect_async(expecter, timeout=None):
    # First process data that was previously read - if it maches, we don't need
    # async stuff.
    previously_read = expecter.spawn.buffer
    expecter.spawn.buffer = expecter.spawn.string_type()
    idx = expecter.new_data(previously_read)
    if idx is not None:
        return idx
    if not expecter.spawn.async_pw_transport:
        pw = PatternWaiter()
        pw.set_expecter(expecter)
        transport, pw = yield from asyncio.get_event_loop()\
            .connect_read_pipe(lambda: pw, expecter.spawn)
        expecter.spawn.async_pw_transport = pw, transport
    else:
        pw, transport = expecter.spawn.async_pw_transport
        pw.set_expecter(expecter)
        transport.resume_reading()
    try:
        return (yield from asyncio.wait_for(pw.fut, timeout))
    except asyncio.TimeoutError as e:
        transport.pause_reading()
        return expecter.timeout(e)


class PatternWaiter(asyncio.Protocol):
    transport = None

    def set_expecter(self, expecter):
        self.expecter = expecter
        self.fut = asyncio.Future()

    def found(self, result):
        if not self.fut.done():
            self.fut.set_result(result)
            self.transport.pause_reading()
    
    def error(self, exc):
        if not self.fut.done():
            self.fut.set_exception(exc)
            self.transport.pause_reading()

    def connection_made(self, transport):
        self.transport = transport
    
    def data_received(self, data):
        spawn = self.expecter.spawn
        s = spawn._decoder.decode(data)
        spawn._log(s, 'read')

        if self.fut.done():
            spawn.buffer += s
            return

        try:
            index = self.expecter.new_data(s)
            if index is not None:
                # Found a match
                self.found(index)
        except Exception as e:
            self.expecter.errored()
            self.error(e)
    
    def eof_received(self):
        # N.B. If this gets called, async will close the pipe (the spawn object)
        # for us
        try:
            self.expecter.spawn.flag_eof = True
            index = self.expecter.eof()
        except EOF as e:
            self.error(e)
        else:
            self.found(index)
    
    def connection_lost(self, exc):
        if isinstance(exc, OSError) and exc.errno == errno.EIO:
            # We may get here without eof_received being called, e.g on Linux
            self.eof_received()
        elif exc is not None:
            self.error(exc)

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