在Python中启动脚本之后的特定时刻计划打印命令

Question

我想在各种时间安排一个文本'hello world'（形成一个列表），因为脚本已经启动。什么是最好的方法来做到这一点？

这可能是错的，但我到目前为止有：

import time 
times = [1.76493425, 3.10174059, 4.49576803, 10.99379224, 18.84178369] #at these times since onset of script, a text "hello world" should be printed 

start = time.time() 

def main(): 
    for cuetime in times: 
     print ('hello world', ' - timing: ', cuetime, ' - now: ', time.time()- start) 
    yield viztask.waitTime(cuetime) 

main() 

这给了我：

('hello world', ' - timing: ', 1.76493425, ' - now: ', 0.0) 
('hello world', ' - timing: ', 3.10174059, ' - now: ', 1.7699999809265137) 
('hello world', ' - timing: ', 4.49576803, ' - now: ', 3.5379998683929443) 
('hello world', ' - timing: ', 10.99379224, ' - now: ', 5.305999994277954) 
('hello world', ' - timing: ', 18.84178369, ' - now: ', 7.075000047683716) 

但我真正需要的是时间要素/项目是一样的“现在”时间，因为时间列表中的元素是相对于剧本开始应该打印文本“hello world”的时间。

Answer 1

schedule模块怎么样。之前还没有和它的工作，但你可以很容易地实现自己的目标：

import schedule 
import time 
from functools import partial 
# your specified list of times 
times = [1.76493425, 3.10174059, 4.49576803, 10.99379224, 18.84178369] 
# define a job you want to do 
def job(t, start): 
    print ('hello world', ' - timing: ', t, ' - now: ', time.time()- start) 
    # pop the job right away from schedule.jobs, so it runs only once 
    return schedule.CancelJob 
# get the starting time 
start = time.time() 
# for each time add what to do 
for t in times: 
    # using partial so i can pass arguments to job 
    schedule.every(t).seconds.do(partial(job, t, start)) 
# and run it inside a lop 
while True: 
    schedule.run_pending() 
    # schedule.jobs is just a list of jobs 
    if not schedule.jobs: 
     break 

打印出：

hello world - timing: 1.76493425 - now: 1.7650279998779297 
hello world - timing: 3.10174059 - now: 3.101846933364868 
hello world - timing: 4.49576803 - now: 4.495898962020874 
hello world - timing: 10.99379224 - now: 10.993950605392456 
hello world - timing: 18.84178369 - now: 18.84195566177368 

Answer 2

查看sched库了解更多详情。这里是一个不是100％准确的代码示例，但是如果您不需要精确度很高的代码，就应该这样做。

import time 
import sched 

def print_time(cuetime): 
    global start 
    print ('hello world', ' - timing: ', cuetime, ' - now: ', time.time()- start) 

start = time.time() 
times = [1.76493425, 3.10174059, 4.49576803, 10.99379224, 18.84178369] 

if __name__ == "__main__": 
    s = sched.scheduler(time.time, time.sleep) 
    for cuetime in times: 
     s.enter(cuetime, 1, print_time, (cuetime,)) 
    s.run()