[Python-Dev] sum(...) limitation
alexander.belopolsky at gmail.com
Sat Aug 9 21:20:42 CEST 2014
On Sat, Aug 9, 2014 at 1:08 AM, Steven D'Aprano <steve at pearwood.info> wrote:
> We wouldn't be having
> these interminable arguments about using sum() to concatenate strings
> (and lists, and tuples) if the & operator was used for concatenation and
> + was only used for numeric addition.
But we would probably have a similar discussion about all(). :-)
Use of + is consistent with the use of * for repetition. What would you
use use for repetition if you use & instead?
Compare, for example
s + ' ' * (n - len(s))
s & ' ' * (n - len(s))
Which one is clearer?
It is sum() that need to be fixed, not +. Not having sum([a, b])
equivalent to a + b for any a, b pair is hard to justify.
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