Idiomatic Python for incrementing pairs

[Carlos Nepomuceno]

Oh! I really though you were just adding 1 or 0 to those variables. In clude the loop next time! ;)

You can accumulate the values by doing this instead:

alpha, beta = (alpha + (1 if some_calculation(params) else 0), beta + (1 if other_calculation(params) else 0))

> Date: Fri, 7 Jun 2013 23:16:22 -0500
> From: python.list at tim.thechases.com
> To: carlosnepomuceno at outlook.com
> CC: python-list at python.org
> Subject: Re: Idiomatic Python for incrementing pairs
> 
> On 2013-06-08 07:04, Carlos Nepomuceno wrote:
> > alpha, beta = (1 if some_calculation(params) else 0, 1 if
> > other_calculation(params) else 0)
> 
> This one sets them to absolute values, rather than the incrementing
> functionality in question:
> 
> > >   alpha += temp_a
> > >   beta += temp_b
> 
> The actual code in question does the initialization outside a loop:
> 
>   alphas_updated = betas_updated = 0
>   for thing in bunch_of_things:
>     a, b = process(thing)
>     alphas_updated += a
>     betas_updated += b
> 
> and it just bugs me as being a little warty for having temp
> variables when Python does things like tuple-unpacking so elegantly.
> That said, as mentioned in a contemporaneous reply to Jason, I haven't
> found anything better that is still readable.
> 
> -tkc
> 
> 
> 
 		 	   		  
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