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 : //lib64/python2.7/Demo/md5test/md5driver.py
import string
import md5
from sys import argv

def MDPrint(str):
    outstr = ''
    for i in str:
        o = ord(i)
        outstr = (outstr
                  + string.hexdigits[(o >> 4) & 0xF]
                  + string.hexdigits[o & 0xF])
    print outstr,


from time import time

def makestr(start, end):
    result = ''
    for i in range(start, end + 1):
        result = result + chr(i)

    return result


def MDTimeTrial():
    TEST_BLOCK_SIZE = 1000
    TEST_BLOCKS = 10000

    TEST_BYTES = TEST_BLOCK_SIZE * TEST_BLOCKS

    # initialize test data, need temporary string filler

    filsiz = 1 << 8
    filler = makestr(0, filsiz-1)
    data = filler * (TEST_BLOCK_SIZE // filsiz)
    data = data + filler[:(TEST_BLOCK_SIZE % filsiz)]

    del filsiz, filler


    # start timer
    print 'MD5 time trial. Processing', TEST_BYTES, 'characters...'
    t1 = time()

    mdContext = md5.new()

    for i in range(TEST_BLOCKS):
        mdContext.update(data)

    str = mdContext.digest()
    t2 = time()

    MDPrint(str)
    print 'is digest of test input.'
    print 'Seconds to process test input:', t2 - t1
    print 'Characters processed per second:', TEST_BYTES / (t2 - t1)


def MDString(str):
    MDPrint(md5.new(str).digest())
    print '"' + str + '"'


def MDFile(filename):
    f = open(filename, 'rb')
    mdContext = md5.new()

    while 1:
        data = f.read(1024)
        if not data:
            break
        mdContext.update(data)

    MDPrint(mdContext.digest())
    print filename


import sys

def MDFilter():
    mdContext = md5.new()

    while 1:
        data = sys.stdin.read(16)
        if not data:
            break
        mdContext.update(data)

    MDPrint(mdContext.digest())
    print


def MDTestSuite():
    print 'MD5 test suite results:'
    MDString('')
    MDString('a')
    MDString('abc')
    MDString('message digest')
    MDString(makestr(ord('a'), ord('z')))
    MDString(makestr(ord('A'), ord('Z'))
              + makestr(ord('a'), ord('z'))
              + makestr(ord('0'), ord('9')))
    MDString((makestr(ord('1'), ord('9')) + '0') * 8)

    # Contents of file foo are "abc"
    MDFile('foo')


# I don't wanna use getopt(), since I want to use the same i/f...
def main():
    if len(argv) == 1:
        MDFilter()
    for arg in argv[1:]:
        if arg[:2] == '-s':
            MDString(arg[2:])
        elif arg == '-t':
            MDTimeTrial()
        elif arg == '-x':
            MDTestSuite()
        else:
            MDFile(arg)

main()

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