[Edu-sig] Truth values and comparisons
Arthur
ajsiegel at optonline.net
Mon Oct 30 19:15:50 CET 2006
John Zelle wrote:
>This is why in teaching I prefer to use explicit tests:
>
>if x != 0:
> do something
>
>Rather than
>
>if x:
> do something
>
>
>
Yeah, so in the case I am looking at there is a branching based on
whether either of 2 arrays are all zeros.
So to achieve numpy compatibility, and to make the code more
understandable to folks (like myself) who have some trouble in switching
gears between numbers being used as numbers and at the same time being
used for their truth values (kind of a trick really), I might do
if sum(x) !=0:
use this array
else:
use other array.
kind of thing.
The case here being distinguishable, in my mind, from the situation
where one purposefully fills an array with 0's and 1's, with the
intention of representing truth values. In *that* case the
if sum(x) !=0
would work just as well, but now would seem to be the trick solution
rather than the elegant one.
Interesting how context matters in these kind of styling questions.
Assuming I am making sense...
Is concerning myself with this distinction sound programming, or is the
hard core answer more to the effect what works works, what doesn't
doesn't - and one should focus only on that, and perhaps the performance
impact of available alternatives?
Though I guess we are all allowed to define "sound programming" for
ourselves.
Art
Art
>--John
>
>
>
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