trigger at TDM/2 only

[cerr]

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