问题
How do I sched a repeat timer for 5 min intervals. Which fire at 00 seconds, then repeat at 00. Ok, not hard real-time but as close as possible with sys lags. Trying to avoid a build up in lags and get near 00.
Lang: Python, OS: WinXP x64
System has 25ms resolution.
Any code would be helpful, tia
回答1:
I don't know how to do it any more accurately than with threading.Timer. It's "one-shot", but that just means the function you schedule that way must immediately re-schedule itself for another 300 seconds later, first thing. (You can add accuracy by measuring the exact time with time.time
each time and varying the next scheduling delay accordingly).
回答2:
Try and compare the time printouts of these two code samples:
Code Sample 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)
Code Sample 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))
来源:https://stackoverflow.com/questions/3553340/with-python-intervals-at-x00-repeat