定时器的暂停/恢复功能 [英] Pause/Resume functions for timer

问题描述

我需要使用一个可以暂停和恢复的计时器.据我所知，Python 中只有一个计时器包含在 threading 包中，但我无法暂停或恢复它，只能取消它.

I need to use a timer which can be paused and resumed. As far as I know there is only one timer in Python which is contained in the threading package, but I cannot pause or resume it, only cancel it.

这是在 Python 中使用计时器的标准代码:

This is a standard code to use the timer in Python:

from threading import Timer
import time

def timeout():
     print "Game over"

t = Timer(20 * 60, timeout)
t.start()

那么我应该怎么做才能用这个定时器实现暂停/恢复功能?

So what should I do to realize pause/resume functions with this timer?

推荐答案

import threading, time

class ResumableTimer:
    def __init__(self, timeout, callback):
        self.timeout = timeout
        self.callback = callback
        self.timer = threading.Timer(timeout, callback)
        self.startTime = time.time()

    def start(self):
        self.timer.start()

    def pause(self):
        self.timer.cancel()
        self.pauseTime = time.time()

    def resume(self):
        self.timer = threading.Timer(
            self.timeout - (self.pauseTime - self.startTime),
            self.callback)

        self.timer.start()

你的作业:

• 继承?
• 例外?检查?
• 比可恢复计时器更好的东西

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