[Numpy-discussion] logical_and operator, &&, is missing? (original) (raw)

Robert Kern robert.kern at gmail.com
Sat Jun 24 17:32:16 EDT 2006

Eric Firing wrote:

That makes sense, and implies that the real solution would be the introduction of operators && and || into Python, or a facility that would allow extensions to add operators. I guess it would be a matter of having hooks into the parser. I have no idea whether either of these is a reasonable goal--but it certainly would be a big plus for Numpy.

I don't really see how. We already have the & and | operators. The only difference between them and the && and || operators would be that the latter would automatically coerce to boolean arrays. But you can do that explicitly, now.

a.astype(bool) | b.astype(bool)

Of course, it's highly likely that you are applying & and | to arrays that are already boolean. Consequently, I don't see a real need for more operators.

But if you'd like to play around with the grammar:

http://www.fiber-space.de/EasyExtend/doc/EE.html

-- Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco

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