[Python-Dev] Expression optimizations (original) (raw)

Cesare Di Mauro cesare.dimauro at a-tono.com
Tue Feb 10 21:43:17 CET 2009

On Mar, Feb 10, 2009 06:24 PM, Daniel Stutzbach wrote:

On Tue, Feb 10, 2009 at 11:16 AM, Steve Holden <steve at holdenweb.com> wrote:

That's true, but the same could be said about the existing optimizations for objects that define their own contains.

No, because there isn't a notcontains, so you cannot define the inverse operation differently. "not a in b" and "a not in b" have exactly the same effects.

Interesting. So at least for "is" and "in" operators it is possible to play with the "not" operator.

Thanks Cesare

More information about the Python-Dev mailing list