timer problem

[flupke]

I have a timer in a program but the function it is supposed
to call, is only executed once.
To simplify searching what i have done wrong, i've made a small
test app
================================
import threading

def command():
print "TIMER CALLED"

t = threading.Timer(2, command )
t.start()
s = raw_input()
t.cancel()
================================
Now, when i run it, it only prints TIMER CALLED once instead
of every 2 seconds.
What am i doing wrong? (Python 2.3.4 on Win2000)

Thanks,
Benedict

[Diez B. Roggisch]

flupke wrote:

Now, when i run it, it only prints TIMER CALLED once instead
of every 2 seconds.
What am i doing wrong? (Python 2.3.4 on Win2000)

You assume that Timer is looping - it isn't. So make your command start a
Timer itself, like this:

def command():
print "called"
t = threading.Timer(2, command )
t.start()
Or use a Thread, with an endless loop in the run()-method that sleeps for
two secdonds. That spares you the overhead of thread-creation.

Regards,

Diez

[flupke]

Diez B. Roggisch wrote:

You assume that Timer is looping - it isn't. So make your command start a
Timer itself, like this:

def command():
print "called"
t = threading.Timer(2, command )
t.start()

Or use a Thread, with an endless loop in the run()-method that sleeps for
two secdonds. That spares you the overhead of thread-creation.

Regards,

Diez

This method (calling the Timer again) indeed works but to effectively
cancel the thread then, i need to make the thread t a class object and
i need to define the command function as a real function as opposed to
an anonymous function (what i tried to do).
Then it might be a better sollution to indeed create my own Timer class.

Benedict