On Mon, Sep 24, 2012 at 07:10:01AM -0500, Jason Grout wrote:
> On 9/24/12 3:55 AM, Nicolas M. Thiery wrote:
> >That being said, if there is a way to raise ValueError in a way that
> >can be turned off like for assertions, I am happy to change my mind!
> >(I am missing this from MuPAD; we could even change this at runtime
> >which was really cool),.
>
> Of course, we can also define a utility function that does this:
>
> validation = True
> def validate(condition, message):
> if not condition and validation:
> raise ValueError(message)
>
>
> def myfunction(bound):
> validate(bound>0, "bound must be positive because the square
> root of the bound is used.")
>
>
> Then changing the value of the validation variable turns on or off
> messages. You still incur the function call cost, which is still a
> negative.
Sorry if I have been unclear; the point is to turn off the *testing of
the condition* altogether, in order not incur a speed penalty. Of
course, this is only relevant for low level methods and/or expensive
conditions.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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