[Python-3000] what do I use in place of reduce?

Alex Martelli aleaxit at gmail.com
Thu Apr 24 06:08:11 CEST 2008


On Wed, Apr 23, 2008 at 6:47 PM, Guido van Rossum <guido at python.org> wrote:
> On Wed, Apr 23, 2008 at 1:56 PM, Nicholas T <ntung at ntung.com> wrote:
>
> >    It's obvious how to use LC's to replace map and filter, but what about
>  > reduce? It is one of my favorite functions.
>  >
>  > >>> time=1901248
>  > >>> reduce(lambda a, b: a[:-1] + [a[-1]%b, math.floor(a[-1]/b)], [[time],
>  > 60, 60, 24])
>  >  [28, 7.0, 0.0, 22.0] # secs, mins, hrs, days
>
>  I recommend learning how to use a good old for-loop. That example is
>  as cryptic as can be. It's also inefficient due to calling a function
>  for each iteration.

I normally frown on "me too" posts, but this time I won't refrain from
a loud "hear, hear!". "Clever" code is NOT a culturally positive trait
in the Python community (differently from most language communities...
and this is in fact one reason I love Python).

Alex


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