trigger at TDM/2 only
cerr
ron.eggler at gmail.com
Fri Jun 7 12:35:50 EDT 2013
DaveA,
Yep, that seems to just be about it! Much easier!
Thanks for the hint! Much appreciated!!!! :)
Ron
On Thursday, June 6, 2013 5:43:11 PM UTC-7, Dave Angel wrote:
> On 06/06/2013 08:03 PM, cerr wrote:
>
> > Hi,
>
> >
>
> > I have a process that I can trigger only at a certain time. Assume I have a TDM period of 10min, that means, I can only fire my trigger at the 5th minute of every 10min cycle i.e. at XX:05, XX:15, XX:25... For hat I came up with following algorithm which oly leaves the waiting while loop if minute % TDM/2 is 0 but not if minute % TDM is 0:
>
> > min = datetime.datetime.now().timetuple().tm_hour*60 + datetime.datetime.now().timetuple().tm_min
>
> > while not (min%tdm_timeslot != 0 ^ min%(int(tdm_timeslot/2)) != 0):
>
>
>
> You might have spent three minutes and simplified this for us. And in
>
> the process discovered the problem.
>
>
>
> (BTW, min() is a builtin function, so it's not really a good idea to be
>
> shadowing it.)
>
>
>
> You didn't give python version, so my sample is assuming Python 2.7
>
> For your code it shouldn't matter.
>
>
>
> tdm = 10
>
> tdm2 = 5
>
>
>
> y = min(3,4)
>
> print y
>
>
>
> for now in range(10,32):
>
> print now, now%tdm, now%tdm2,
>
> print not(now % tdm !=0 ^ now%tdm2 !=0) #bad
>
> print not((now % tdm !=0) ^ (now%tdm2 !=0)) #good
>
>
>
>
>
> Your problem is one of operator precedence. Notice that ^ has a higher
>
> precedence than != operator, so you need the parentheses I added in the
>
> following line.
>
>
>
> What I don't understand is why you used this convoluted approach. Why not
>
>
>
> print now%tdm != tdm2
>
>
>
> For precedence rules, see:
>
> http://docs.python.org/2/reference/expressions.html#operator-precedence
>
>
>
>
>
>
>
>
>
> --
>
> DaveA
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