[Python-ideas] Rehabilating reduce (as "fold")

[Brett Cannon]

On Fri, Jul 12, 2013 at 10:54 AM, Barry Warsaw <barry at python.org> wrote:

> On Jul 12, 2013, at 04:01 PM, Nick Coghlan wrote:
>
> >I'd personally be in favour of the notion of also allowing strings as the
> >first argument, so you could instead write:
> >
> >    data = fold("+=", [], iterables)
>
> You had me until here...
>
> >(Independent of this idea, it would actually be nice if the operator
> module
> >had a dictionary mapping from op symbols to names, like
> >operator.by_symbol["+="] giving operator.iadd)
>
> ...but this is a neat idea.
>

+1 from me as well. The table already exists in the docs (
http://docs.python.org/3.4/library/operator.html#module-operator), it just
needs to be codified. Maybe operator.map['+='] or
operator.from_syntax['+=']. Go really nuts and support ['.attribute'] or
['[42]'] to auto-generate attrgetter or itemgetter instances, but that's
probably just asking for support problems.
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