> To make a time lapse video I've been playing with the sched module.
> There is one problem I run into, in the code below, how do I get the
> returned value t from printtime into main?
This is one place where you really are best to use a global variable IMHO.
There are some clever tricks using classes and so on but its really much
simpler to just define a global which is visible to both main and
printtime()
> import time
> from sched import scheduler
>
> class time_lapse(scheduler):
> def time_lapse(self, start_time, stop_time, interval, priority,
> action, argument):
> def lapse():
> action(*argument)
One possible alternative is to store the return value gere as an attribute.
Then main can query the object.
> def printtime(strf=None):
> t=time.time()
> if strf:
> print time.strftime("%Y%m%d_%H%M%S")
> else:
> print time.localtime()
> return t
I'd keep t as a local but assign the final value to a global with
a clear and unambiguous name.
> def main():
> schedule = time_lapse(time.time, time.sleep)
> start=time.time()
> stop=list(time.localtime(start))
> stop[3]=stop[3]+2
> stop=time.mktime(stop)
>
> schedule.time_lapse(start,stop,7,0,printtime,(1,))
>
> schedule.run()
However the real question I have is how you intend to
access that result value. Is it a single value at the end
you want or the cumulative set of values from each
scheduled call?
Alan G.
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