Python利用正则表达式从日志文件中提取并去重IP地址

Luna

发布时间：2026-10-13 | 2人浏览过

原创

本文介绍如何使用Python结合正则表达式从log日志文件中高效提取IP地址。通过定义特定的正则模式匹配IPv4格式，利用列表存储结果并借助set集合实现自动去重，最终输出唯一IP列表及处理耗时。该方法适用于服务器日志分析场景，代码包含完整的文件读写与异常处理逻辑，可直接复用。

本文详细介绍一种使用Python从log日志中提取IP地址的实现方案，旨在为相关开发者提供实用的参考代码与思路。

假设日志文件名为myjob.log，其内容格式如下所示：

124.90.53.68 - - [05/Feb/2018 11:37:07] "GET /favicon.ico HTTP/1.1" 404 -
61.148.245.145 - - [05/Feb/2018 12:37:44] "GET / HTTP/1.1" 200 -
61.148.245.145 - - [05/Feb/2018 12:37:44] "GET /apple-touch-icon-120x120-precomposed.png HTTP/1.1" 404 -
61.148.245.145 - - [05/Feb/2018 12:37:44] "GET /apple-touch-icon-120x120.png HTTP/1.1" 404 -
61.148.245.145 - - [05/Feb/2018 12:37:45] "GET /apple-touch-icon-precomposed.png HTTP/1.1" 404 -
61.148.245.145 - - [05/Feb/2018 12:37:45] "GET /apple-touch-icon.png HTTP/1.1" 404 -
61.148.245.145 - - [05/Feb/2018 12:37:45] "GET /static/favicon.ico HTTP/1.1" 200 -
101.226.33.218 - - [05/Feb/2018 13:07:39] "GET / HTTP/1.1" 200 -
101.226.33.219 - - [05/Feb/2018 13:09:46] "GET / HTTP/1.1" 200 -
101.226.33.219 - - [05/Feb/2018 13:09:46] "GET /static/youkulogo.png HTTP/1.1" 200 -
101.226.33.219 - - [05/Feb/2018 13:09:46] "GET /static/iqiyi.png HTTP/1.1" 200 -
101.226.33.219 - - [05/Feb/2018 13:09:46] "GET /static/qqlogo.png HTTP/1.1" 200 -
124.202.223.62 - - [05/Feb/2018 14:29:45] "GET / HTTP/1.1" 200 -
124.202.223.62 - - [05/Feb/2018 14:29:47] "GET /static/youkulogo.png HTTP/1.1" 200 -
124.202.223.62 - - [05/Feb/2018 14:29:48] "GET /static/qqlogo.png HTTP/1.1" 200 -
124.202.223.62 - - [05/Feb/2018 14:29:48] "GET /static/iqiyi.png HTTP/1.1" 200 -
124.202.223.62 - - [05/Feb/2018 14:29:49] "GET /static/favicon.ico HTTP/1.1" 200 -

以下是用于提取IP地址的核心代码逻辑：

# encoding: utf-8
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
import pandas as pd
import re
import time
import requests
time1=time.time()
######函数功能:能够提取ip地址，并且去重################
def read_file(input_file_name,output_file_name):
  _fLog = open(input_file_name)
  sep = '\n'
  ip_list=[]
  for each in _fLog:
    ip=re.findall(r'(?<![\.\d])(?:\d{1,3}\.){3}\d{1,3}(?![\.\d])',str(each),re.S)
    ip_list.append(ip[0])
  # 列表去重:通过set方法进行处理
  ids = list(set(ip_list))
  print "共解析ip个数:%s "% len(ids)
  ##写出数据到本地
  # 设置输出文件路径
  out = open(output_file_name, "a")
  # out.write("ip" + sep)
  for each in ids:
    print each
    out.write(each + sep)
  ##关闭连接
  out.close()
  _fLog.close()
  print "ip提取完毕~~"
####主函数################
if __name__ == '__main__':
  input_file_name = "C:/myjob.log"
  output_file_name = "c:/myjob.txt"
  read_file(input_file_name, output_file_name)
  time2 = time.time()
  print u'总共耗时：' + str(time2 - time1) + 's'

执行上述代码后的运行结果如下：