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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: how to call a function for evry 10 secs
Date: Wed, 29 Jun 2011 22:06:22 -0700
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:8591

On Wed, 29 Jun 2011 10:39:26 -0700 (PDT), hisan <santosh.ssit@gmail.com>
declaimed the following in gmane.comp.python.general:

> Hi All,
> I need to call a function for evry 10 secs
> how can i achieve this in python

	Do you mean you need a 10 second delay BETWEEN each call of the
function? OR do you mean the function must be called every 10 seconds
(as long as the function completes in less than 10 seconds).

	The first is the simple one that's no doubt been shown already

>>> import time
>>>
>>> def dumpTime(t):
...     print t
...     time.sleep(5)
...
>>> while True:
...     dumpTime(time.clock())
...     time.sleep(10)
...
68.0374675818
83.0283211852
98.0280303107
113.027740058
128.027449863
143.027157991
158.026871578
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "<stdin>", line 3, in dumpTime
KeyboardInterrupt
>>>

	The other gets more complex

>>> import time
>>>
>>> def dumpTime(t):
...     print t
...     time.sleep(5)
...
>>> while True:
...     last = time.clock()
...     dumpTime(last)
...     time.sleep((last + 10.0) - time.clock())
...
199.787792062
209.791497063
219.791306975
229.79110609
239.790991578
249.790718419
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "<stdin>", line 3, in dumpTime
KeyboardInterrupt
>>>

	But if the function itself runs for longer than 10 seconds, there
will be a major problem, as the sleep apparently takes the argument as
unsigned, and a negative number is a very big sleep!

>>> import time
>>>
>>> def dumpTime(t):
...     print t
...     time.sleep(11)
...
>>> while True:
...     last = time.clock()
...     dumpTime(last)
...     time.sleep((last + 10.0) - time.clock())
...
403.96232976
Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
KeyboardInterrupt
>>> time.clock()
498.87339572032164
>>>

	Better limit the sleep

>>> import time
>>>
>>> def dumpTime(t):
...     print t
...     time.sleep(11)
...
>>> while True:
...     last = time.clock()
...     dumpTime(last)
...     time.sleep(max(0.0, (last + 10.0) - time.clock()))
...
608.521519761
619.517915274
630.517711063
641.5175254
652.517293743
663.517072219
674.516939156
685.516625507
696.516427311
707.516240174
718.515978656
729.51577823
740.515593446
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "<stdin>", line 3, in dumpTime
KeyboardInterrupt

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/