Python monitoring file content changes

Use seek to monitor file content and print out changes:

#/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 (): Brea K Con.close ()

Use the tool pyinotify Monitor file content changes, when the file becomes larger, you can easily complete the task:

#!/usr/bin/env python#-*- coding=utf-8 -*-import osimport datetimeimport  Pyinotifyimport loggingpos = 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 (): Breakfd.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 ()

Python monitoring file content changes