[Python-ideas] Parametrized any() and all() ? (original) (raw)

Tarek Ziadé tarek at ziade.org
Wed Jan 16 15:52:19 CET 2013

On 1/16/13 3:10 PM, Steven D'Aprano wrote:

On 16/01/13 22:10, Nick Coghlan wrote:

On Wed, Jan 16, 2013 at 8:44 PM, Tarek Ziadé<tarek at ziade.org> wrote:

On 1/16/13 11:33 AM, Laurens Van Houtven wrote:

Hey Tarek, I would write that as any(x is None for x in it)

But here you're building yet another iterable to adapt it to any(), which seems to me overkill if we can just parametrized the loop in any() Such a micro-optimization isn't worth the cost of adding a second way to do it that everyone will then need to learn. For all we know, adding a filter function will be a pessimization, not an optimization, using more memory and/or being slower than using a generator expression. It certainly isn't clear to me that creating a generator expression like (x is None for x in it) is more expensive than creating a filter function like (lambda x: x is None). -1 on adding a filter function.

I abandoned the idea,

but I'd be curious to understand how creating several iterables with one that has an 'if', can be more efficient than having a single iterable with an 'if'...

-- Tarek Ziadé · http://ziade.org · @tarek_ziade

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