Hi Ingo,
I'm coming into this thread a little late, but looking at your original
program:
http://mail.python.org/pipermail/tutor/2006-March/045505.html
you may want to adjust your schedule function a bit to capture return
values. As far as I can tell, the code throws them away when it calls
action().
###################################################################
class time_lapse(scheduler):
def time_lapse(self, start_time, stop_time, interval, priority,
action, argument):
def lapse():
action(*argument)
i=self.enter(interval, priority, lapse, ())
if stop_time:
if stop_time<self.timefunc():
self.cancel(i)
self.enterabs(start_time, priority, lapse, ())
###################################################################
But since the scheduler runs in a separate loop than the rest of your
program, trying to return a value between the two won't work very well.
However, there are other approaches: we can use some kind of shared
container or communication channel between the main() and the scheduler,
so that they can communicate.
One possible way they can communicate is with a shared Queue:
http://www.python.org/doc/lib/module-Queue.html
Here is an example that may help:
######################################################################
from sched import scheduler
import time
from Queue import Queue
from threading import Thread
s = scheduler(time.time, time.sleep)
q = Queue()
PRIORITY = 1
def f(n):
"""Pushes n into the queue, and then reschedules itself with
n+1 to run five seconds later"""
q.put(n)
s.enter(5, PRIORITY, f, (n+1,))
## Let's prime things up. We'll set up the scheduler, and then have
## it run on its own daemon thread.
s.enter(5, PRIORITY, f, (0,))
t = Thread(target=s.run)
t.setDaemon(True)
t.start()
## At this point, our main thread of execution is separate from the
## scheduler thread t.
while True:
print "Waiting for event on queue."
print q.get()
######################################################################
Does this make sense?
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