使用python: intervals at x:00重复

Question

如何将重复计时器安排为5分钟间隔。它在00秒时触发，然后在00秒重复。好吧，不是硬实时的，但尽可能接近sys的延迟。试图避免积聚在滞后和接近00。

Lang: Python，操作系统: WinXP x64

系统分辨率为25ms。

任何代码都会有帮助的，tia

Answer 1

我不知道如何做得比使用threading.Timer更准确。它是“一次性的”，但这只是意味着你以这种方式调度的函数必须立即重新调度自己，并在300秒后进行另一次调度。(您可以通过每次使用time.time测量准确的时间并相应地改变下一次调度延迟来提高准确性)。

Answer 2

尝试比较这两个代码示例的时间打印输出：

代码示例1

import time
delay = 5

while True:
    now = time.time()
    print time.strftime("%H:%M:%S", time.localtime(now))

    # As you will observe, this will take about 2 seconds,
    # making the loop iterate every 5 + 2 seconds or so.
    ## repeat 5000 times
    for i in range(5000):
        sum(range(10000))

    # This will sleep for 5 more seconds
    time.sleep(delay)

代码示例2

import time
delay = 5

while True:
    now = time.time()
    print time.strftime("%H:%M:%S", time.localtime(now))

    # As you will observe, this will take about 2 seconds,
    # but the loop will iterate every 5 seconds because code 
    # execution time was accounted for.
    ## repeat 5000 times
    for i in range(5000):
        sum(range(10000))

    # This will sleep for as long as it takes to get to the
    # next 5-second mark
    time.sleep(delay - (time.time() - now))