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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/lib/python3.6/site-packages/jwt/compat.py

"""
The `compat` module provides support for backwards compatibility with older
versions of python, and compatibility wrappers around optional packages.
"""
# flake8: noqa
import hmac
import struct
import sys


PY3 = sys.version_info[0] == 3


if PY3:
    text_type = str
    binary_type = bytes
else:
    text_type = unicode
    binary_type = str

string_types = (text_type, binary_type)


try:
    constant_time_compare = hmac.compare_digest
except AttributeError:
    # Fallback for Python < 2.7
    def constant_time_compare(val1, val2):
        """
        Returns True if the two strings are equal, False otherwise.

        The time taken is independent of the number of characters that match.
        """
        if len(val1) != len(val2):
            return False

        result = 0

        for x, y in zip(val1, val2):
            result |= ord(x) ^ ord(y)

        return result == 0

# Use int.to_bytes if it exists (Python 3)
if getattr(int, 'to_bytes', None):
    def bytes_from_int(val):
        remaining = val
        byte_length = 0

        while remaining != 0:
            remaining = remaining >> 8
            byte_length += 1

        return val.to_bytes(byte_length, 'big', signed=False)
else:
    def bytes_from_int(val):
        buf = []
        while val:
            val, remainder = divmod(val, 256)
            buf.append(remainder)

        buf.reverse()
        return struct.pack('%sB' % len(buf), *buf)

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