John O'Hagan <resea...@johnohagan.com> wrote:
> Is there a concise Pythonic way to write a method with a timeout?
>
> I did this:
>
> class Eg(object):
>
> def get_value(self, timeout):
>
> from threading import Timer
> self.flag = True
>
> def flag_off():
> self.flag = False
> timer = Timer(timeout, flag_off)
> timer.start()
>
> while self.flag:
> #do stuff for a long time to get some value
> if condition: #if we ever get the value
> self.value = value
> break
>
> but it seems hackish to have a special "flag" attribute just to manage the
> timeout within the the method.
How about something like this
from threading import Timer
class Duration(object):
def __init__(self, duration):
self.running = True
self.timer = Timer(duration, self.set_finished)
self.timer.setDaemon(True)
self.timer.start()
def set_finished(self):
self.running = False
def __nonzero__(self):
return self.running
from time import sleep
def long_function():
duration = Duration(5)
i = 0
print "starting"
while duration:
print i
i += 1
sleep(1)
print "finished"
long_function()
Which prints
starting
0
1
2
3
4
finished
--
Nick Craig-Wood <n...@craig-wood.com> -- http://www.craig-wood.com/nick
--
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