在 Python 中，如何让线程休眠直到特定时间? [英] In Python, how can I put a thread to sleep until a specific time?

问题描述

我知道我可以通过以下方式使线程休眠特定时间:

I know that I can cause a thread to sleep for a specific amount of time with:

time.sleep(NUM)

如何让线程休眠到凌晨 2 点?我是否必须做数学计算才能确定到凌晨 2 点的秒数?或者有什么库函数?

How can I make a thread sleep until 2AM? Do I have to do math to determine the number of seconds until 2AM? Or is there some library function?

(是的，我知道 Windows 中的 cron 和等效系统，但我想在 python 中适当地睡眠我的线程，而不是依赖外部刺激或进程信号.)

( Yes, I know about cron and equivalent systems in Windows, but I want to sleep my thread in python proper and not rely on external stimulus or process signals.)

推荐答案

这是一个不考虑时钟抖动或时钟调整的半解决方案.有关摆脱这种情况的方法，请参阅评论.

Here's a half-ass solution that doesn't account for clock jitter or adjustment of the clock. See comments for ways to get rid of that.

import time
import datetime

# if for some reason this script is still running
# after a year, we'll stop after 365 days
for i in xrange(0,365):
    # sleep until 2AM
    t = datetime.datetime.today()
    future = datetime.datetime(t.year,t.month,t.day,2,0)
    if t.hour >= 2:
        future += datetime.timedelta(days=1)
    time.sleep((future-t).total_seconds())
    
    # do 2AM stuff

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