Function to terminate while loop in python?

Question

I would like to create a function keep_running that I could define based on input to either be sensitive to the time that it had been running or the number of iterations. I can't seem to come up with a pythonic way to do the iterations without decrementing the counter outside of the function, e.g.:

def keep_running(ttl):
    return ttl > 0

ttl = 1
while keep_running(ttl):
    do_stuff()
    ttl -= 1

Is there a better way to do this, preferably completely within the function keep_running?

recursive · Accepted Answer · 2013-04-08 23:37:25Z

2

The best way to manage state is probably inside a class. You could initialize an object loop_context with a ttl value, and then your loop condition would be loop_context.keep_running().

answered Apr 8, 2013 at 23:37

recursive

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Sheng · Accepted Answer · 2013-04-08 23:43:42Z

2

I am not quite sure about your demand. But iterator might useful for you. Use a iterator, it could be:

>>> def keep_running(ttl):
    while ttl>0:
        yield ttl
        ttl -= 1
>>> for one_round in keep_running(3):
    print(time.time())

Result is:

1365464545.465
1365464545.495
1365464545.505

answered Apr 8, 2013 at 23:43

Sheng

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