[Python-Dev] Small any/all enhancement (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Tue Dec 27 22:49:58 CET 2005

Valentino Volonghi aka Dialtone wrote:

What I would like to ask, before it's too late, is if it's possible to add an optional test argument.

I don't see why: you can easily synthesize that with map/imap.

These would be the new proposed APIs. The usecase is to be able to extract attributes from objects or simply to have arbitrary checks like:

import operator any(someobjects, test=operator.attrgetter('someattribute'))

So write

any(map(operator.attrgetter('some_attribute'), some_objects))

same number of characters to type

any(o.some_attribute for o in some_objects)

fewer number of characters

def zerop(x): return x==0

all(someobjects, zerop)

So write

all(map(some_objects, zerop)) or all(o==0 for o in some_objects)

avoids defining zerop

instead of preprocessing the generator with a generator expression before passing it to any/all.

What is the disadvantage of such "preprocessing"?

Regards, Martin

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