使用Python监控文件内容变化代码实例_Python

使用Python监控文件内容变化代码实例

2021-02-28 00:25guoswcfl Python

在python中文件监控主要有两个库，一个是pyinotify，一个是watchdog。pyinotify依赖于Linux平台的inotify，今天我们就来探讨下pyinotify.

利用seek监控文件内容，并打印出变化内容：

									#/usr/bin/env python

									#-*- coding=utf-8 -*-

									pos = 0

									while True:

									  con = open("a.txt")

									  if pos != 0:

									    con.seek(pos,0)

									  while True:

									  line = con.readline()

									  if line.strip():

									    print line.strip()

									  pos = pos + len(line)

									  if not line.strip():

									    break

									  con.close()

利用工具pyinotify监控文件内容变化，当文件逐渐变大时，可轻松完成任务：

									#!/usr/bin/env python

									#-*- coding=utf-8 -*-

									import os

									import datetime

									import pyinotify

									import logging

									pos = 0

									def printlog():

									  global pos

									  try:

									    fd = open("log/a.txt")

									  if pos != 0:

									    fd.seek(pos,0)

									  while True:

									    line = fd.readline()

									    if line.strip():

									      print line.strip()

									    pos = pos + len(line)

									    if not line.strip():

									    break

									  fd.close()

									  except Exception,e:

									  print str(e)

									class MyEventHandler(pyinotify.ProcessEvent):

									  def process_IN_MODIFY(self,event):

									    try:

									    printlog()

									  except Exception,e:

									    print str(e)

									def main():

									  printlog()

									  wm = pyinotify.WatchManager()

									  wm.add_watch("log/a.txt",pyinotify.ALL_EVENTS,rec=True)

									  eh = MyEventHandler()

									  notifier = pyinotify.Notifier(wm,eh)

									  notifier.loop()

									if __name__ == "__main__":

									  main()