Question

How can I make classical timer in gevent?

I’m currently using gevent.spawn_later but is there a way to use core.timer like saying “do callback on interval” just like cron does?

def callback():
    # do something
    print '!'

timer = core.timer(10, callback)
timer.start()

outpout:
0s
10s  !
20s  !
30s  !

Answer 1

On the top of my head, you can use gevent.sleep in a loop:

import gevent
import gevent.monkey

gevent.monkey.patch_all()

INTERVAL = 10

def callback():
    # do something
    print "!"

def loop():
    while True:
        gevent.sleep(INTERVAL)
        callback()

gevent.Greenlet.spawn(loop)

Of course, you may put this code in a nice API such as core.timer. But I’ll let all the fun for you 🙂