从频繁更新的文件中读取

从频繁更新的文件中读取

我建议看一下David Beazley的Python生成器技巧，尤其是
第5部分：处理无限数据 。它将

tail -f logfile

实时处理与命令等效的Python 。

# follow.py## Follow a file like tail -f.import timedef follow(thefile):    thefile.seek(0,2)    while True:        line = thefile.readline()        if not line: time.sleep(0.1) continue        yield lineif __name__ == '__main__':    logfile = open("run/foo/access-log","r")    loglines = follow(logfile)    for line in loglines:        print line,