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 = 0while 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 osimport datetimeimport pyinotifyimport logging pos = 0def 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()