[Python-ideas] Another attempt at a sum() alternative: the concatenation protocol

[David Mertz]

On Tue, Jul 16, 2013 at 10:34 AM, Serhiy Storchaka <storchaka at gmail.com>wrote:

> 16.07.13 16:01, Nick Coghlan написав(ла):
>
>  In effect, PEP 448 goes further than making chain a builtin: it gives
>> it syntax! With PEP 448, the generator expression:
>>
>>      (*itr for itr in iterables)
>>
>> would be equivalent to either of the current:
>>
>>      itertools.chain(*iterables)
>>      itertools.chain.from_iterable(**iterables)
>>
>
> This looks as an argument against PEP 448. Why we need a new syntax if we
> can do this just with existent function?


PEP 448 would make a bunch of other contexts work differently too, and
arguably improved.  It's just an edge-case side-effect that it gives us
syntax for a function in itertools in the process. The large majority of
what PEP 448 would change has no relation to itertools.chain.



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