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 : //lib/python3.6/site-packages/pip/utils/logging.py
from __future__ import absolute_import

import contextlib
import logging
import logging.handlers
import os

try:
    import threading
except ImportError:
    import dummy_threading as threading

from pip.compat import WINDOWS
from pip.utils import ensure_dir

try:
    from pip._vendor import colorama
# Lots of different errors can come from this, including SystemError and
# ImportError.
except Exception:
    colorama = None


_log_state = threading.local()
_log_state.indentation = 0


@contextlib.contextmanager
def indent_log(num=2):
    """
    A context manager which will cause the log output to be indented for any
    log messages emitted inside it.
    """
    _log_state.indentation += num
    try:
        yield
    finally:
        _log_state.indentation -= num


def get_indentation():
    return getattr(_log_state, 'indentation', 0)


class IndentingFormatter(logging.Formatter):

    def format(self, record):
        """
        Calls the standard formatter, but will indent all of the log messages
        by our current indentation level.
        """
        formatted = logging.Formatter.format(self, record)
        formatted = "".join([
            (" " * get_indentation()) + line
            for line in formatted.splitlines(True)
        ])
        return formatted


def _color_wrap(*colors):
    def wrapped(inp):
        return "".join(list(colors) + [inp, colorama.Style.RESET_ALL])
    return wrapped


class ColorizedStreamHandler(logging.StreamHandler):

    # Don't build up a list of colors if we don't have colorama
    if colorama:
        COLORS = [
            # This needs to be in order from highest logging level to lowest.
            (logging.ERROR, _color_wrap(colorama.Fore.RED)),
            (logging.WARNING, _color_wrap(colorama.Fore.YELLOW)),
        ]
    else:
        COLORS = []

    def __init__(self, stream=None):
        logging.StreamHandler.__init__(self, stream)

        if WINDOWS and colorama:
            self.stream = colorama.AnsiToWin32(self.stream)

    def should_color(self):
        # Don't colorize things if we do not have colorama
        if not colorama:
            return False

        real_stream = (
            self.stream if not isinstance(self.stream, colorama.AnsiToWin32)
            else self.stream.wrapped
        )

        # If the stream is a tty we should color it
        if hasattr(real_stream, "isatty") and real_stream.isatty():
            return True

        # If we have an ASNI term we should color it
        if os.environ.get("TERM") == "ANSI":
            return True

        # If anything else we should not color it
        return False

    def format(self, record):
        msg = logging.StreamHandler.format(self, record)

        if self.should_color():
            for level, color in self.COLORS:
                if record.levelno >= level:
                    msg = color(msg)
                    break

        return msg


class BetterRotatingFileHandler(logging.handlers.RotatingFileHandler):

    def _open(self):
        ensure_dir(os.path.dirname(self.baseFilename))
        return logging.handlers.RotatingFileHandler._open(self)


class MaxLevelFilter(logging.Filter):

    def __init__(self, level):
        self.level = level

    def filter(self, record):
        return record.levelno < self.level

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