如何每隔 n 秒调用一次 function？

Question

If I do:

def my_api_query():
    pass

while True:
    my_api_query()
    time.sleep(5)

This would work like execution time of my_api_query() plus 5 seconds, which is longer than 5 seconds.

I want one iteration to be executed exactly every 5th second.

How can I implement it in Python 3?

Answer 1

I think I found a solution, need to test it, any other suggestions are welcome:

import threading

def my_api_query():
  threading.Timer(5.0, my_api_query).start()
  some code

my_api_query()

Answer 2

Another solution is quite clumsy, but should be working

import time
nexttime = time.time()
while True:
    my_api_query()          # take t sec
    nexttime += 10
    sleeptime = nexttime - time.time()
    if sleeptime > 0:
        time.sleep(sleeptime)