本文实例讲述了Python实现读取文件最后n行的方法。分享给大家供大家参考，具体如下：

# -*- coding:utf8-*-

import os

import time

import datetime

import math

import string

def get_last_line(inputfile) :

filesize = os.path.getsize(inputfile)

blocksize = 1024

dat_file = open(inputfile, 'r')

last_line = ""

lines = dat_file.readlines()

count = len(lines)

if count>60:

num=60

else:

num=count

i=1;

lastre = []

for i in range(1,(num+1)):

if lines :

n = -i

last_line = lines[n].strip()

#print "last line : ", last_line

dat_file.close()

#print i

lastre.append(last_line)

return lastre

#获取最后一行的结果

re = get_last_line('../update/log/rtime/rtime20130805.log')

print len(re)

for n in re:

strlist = n.split(' ')

if strlist[1] == 'ok' and string.atoi(strlist[2])>1000:

print '数据条数正常'

print 'OK'

else:

print '数据太少，检查发邮件'

以上处理和日志文件格式为

2013-08-05 16:09:30 ok 1673

2013-08-05 16:10:34 ok 1628

2013-08-05 16:11:55 ok 71

2013-08-05 16:13:02 ok 1441

2013-08-05 16:14:06 ok 1634

2013-08-05 16:15:10 ok 1717

2013-08-05 16:16:14 ok 1687

2013-08-05 16:17:18 ok 1642

2013-08-05 16:18:27 ok 1655

2013-08-05 16:19:33 ok 1655

读取最后一行：

#返回文件最后一行函数

def get_last_line(inputfile) :

filesize = os.path.getsize(inputfile)

blocksize = 1024

dat_file = open(inputfile, 'r')

last_line = ""

if filesize > blocksize :

maxseekpoint = (filesize // blocksize)

dat_file.seek((maxseekpoint-1)*blocksize)

elif filesize :

#maxseekpoint = blocksize % filesize

dat_file.seek(0, 0)

lines = dat_file.readlines()

if lines :

last_line = lines[-1].strip()

#print "last line : ", last_line

dat_file.close()

return last_line

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