[Python-Dev] sum(...) limitation

Stefan Behnel stefan_ml at behnel.de
Sat Aug 2 17:06:10 CEST 2014

Alexander Belopolsky schrieb am 02.08.2014 um 16:52:
> On Sat, Aug 2, 2014 at 3:39 AM, Steven D'Aprano wrote:
>> String concatenation with + is an attractive
>> nuisance for many people, including some who actually know better but
>> nevertheless do it. Also, for reasons I don't understand, many people
>> dislike or cannot remember to use ''.join.
> Since sum() already treats strings as a special case, why can't it simply
> call (an equivalent of) ''.join itself instead of telling the user to do
> it?  It does not matter why "many people dislike or cannot remember to use
> ''.join" - if this is a fact - it should be considered by language
> implementors.

I don't think sum(strings) is beautiful enough to merit special cased
support. Special cased rejection sounds like a much better way to ask
people "think again - what's a sum of strings anyway?".


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