Python计时以触发特定事件 [英] Python timing in order to trigger specific events
问题描述
在Python中,我想运行一个调用默认动作的函数,持续20秒.但是,在这20秒内有5个特定的时间触发其他功能.为了简化代码,我用简单的打印命令替换了动作"功能.
In Python I would like to run a function calling a default action for 20 seconds. However, there are 5 specific timings within these 20 seconds when another function should be triggered. In order to simplify my code, I have replaced the "action" functions with simple printing commands.
这是我到目前为止的内容-输出似乎还可以,它持续10秒钟,并打印时间和默认状态/动作.但是触发的动作丢失了!有没有更好/正确的方法可以做到这一点?
Here is what I have so far - The output seems ok, in that it lasts for 10 seconds and prints the time and the default state/action. But the triggered action is missing! Is there a better/correct way to do this?
import random
import time
import numpy as np
import itertools
def uniform_min_range(a, b, n, min_dist):
while True:
atimes = np.random.uniform(a, b, size=n)
np.sort(atimes)
if np.all(np.diff(atimes) >= min_dist):
return atimes
def timings():
global times
times = uniform_min_range(0, 20, 5, 1.0)
print 'beep times: ', times
def defaultAction():
global start
print 'wobble'
def triggeredAction():
global start
print 'actionnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn'
def main():
global times
timings()
print 'beep times: ', times
start = time.time()
t_end = time.time() + 20 #### end after 20 seconds
while time.time() < t_end: #### for 20 sec/ until end reached
print str(time.time()-start)
if (time.time()-start) == times[0] or (time.time()-start) == times[1] or (time.time()-start) == times[2] or (time.time()-start) == times[3]:
triggeredAction()
elif (time.time()-start) != times[0] or (time.time()-start) != times[1] or (time.time()-start) != times[2] or (time.time()-start) != times[3]:
defaultAction()
print "END"
main()
推荐答案
time.time()
返回自纪元以来的第二个浮点数,例如:
time.time()
returns second since epoch as a floating point number like:
>>> import time
>>> time.time()
1465572505.891256
如果您的比较:
time.time()-start) == times[0]
到time.time()
的时间不能精确到微秒(这取决于系统),因此==
不会为True,并且您将永远无法获得triggeredAction()
.
to time.time()
isn't correct down to the microsecond (this depends on the system), then the ==
won't be True and you'll never get your triggeredAction()
.
如果适合您,请在第二秒之前执行操作,请使用:
int(time.time())
,并对uniform_min_range
返回值执行相同的操作-假设每秒分辨率对您来说还可以.否则,您需要为触发的动作检查引入一个范围(+或-1s).
Do things by the second if that works for you, use:
int(time.time())
and do the same for your uniform_min_range
return values - assuming per second resolution is ok for you. Otherwise you'll need to introduce a range (+ or - 1s) to your triggered action check.
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