tail -f 在 python 中没有 time.sleep [英] tail -f in python with no time.sleep

问题描述

我需要在 python 中模拟tail -f"，但我不想在阅读循环中使用 time.sleep.我想要一些更优雅的东西，比如某种阻塞读取，或者 select.select 超时，但 python 2.6select"文档特别指出:它不能用于常规文件来确定自上次读取以来文件是否增长."还有什么办法吗?几天后，如果没有给出解决方案，我将阅读 tail 的 C 源代码以试图弄清楚.我希望他们不要用睡眠，嘿嘿谢谢.

I need to emulate "tail -f" in python, but I don't want to use time.sleep in the reading loop. I want something more elegant like some kind of blocking read, or select.select with timeout, but python 2.6 "select" documentation specifically says: "it cannot be used on regular files to determine whether a file has grown since it was last read." Any other way? In a few days if no solution is given I will read tail's C source code to try to figure it out. I hope they don't use sleep, hehe Thanks.

马里奥

推荐答案

(update)要么使用FS监控工具

(update) Either use FS monitors tools

• 对于 linux
• 对于 Windows
• 对于 Mac

或者单次睡眠使用(我认为这更优雅).

Or a single sleep usage (which I would you consider as much more elegant).

import time
def follow(thefile):
    thefile.seek(0,2)      # Go to the end of the file
    while True:
         line = thefile.readline()
         if not line:
             time.sleep(0.1)    # Sleep briefly
             continue
         yield line

logfile = open("access-log")
loglines = follow(logfile)
for line in loglines:
    print line

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