[Python-3000] map, filter, reduce

[Georg Brandl]

Terry Reedy schrieb:
> "Jason Orendorff" <jason.orendorff at gmail.com> wrote in message 
> news:bb8868b90706010905p2dae12b7qc538cf25190c7127 at mail.gmail.com...
> | PEP 3100 still isn't clear on the fate of these guys, except that
> | reduce() is gone.
> |
> | How about moving all three to the functools module instead?
> 
> The current reduce is broken due to being a mashing together of two 
> versions of the function (one 2 params, the other 3), with the 3-param one 
> having an ill-formed signature (inconsistent parameter order) to allow the 
> mashing that should not have been done.  (The ill-formed signature is hard 
> to remember and is responsible for part of some peoples' dislike of 
> reduce.) I would like a proper 3-param version in functools, but have not 
> writen the exact proposal yet since library changes have been put off.
> 
> I am also thinking about an ireduce, but need to make sure it cannot be 
> easily done with current itertools.

How should an "ireduce" work? The result is not a sequence which could be
returned lazily.

Georg


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