[Numpy-discussion] isnan bug?

Chris Withers chris@simplistix.co...
Thu Mar 20 18:11:29 CDT 2008


Eric Firing wrote:
> I don't see why you consider this a bug.  isnan tests whether an 
> instance of a numeric type is a nan or not;

Why does it limit to numeric types?
isnan sounds pretty boolean to me, anything that isn't nan should return 
False, regardless of type, in the same way as I can do:

isinstance(*anything*,SomeClass)

...and not have it blow up in my face.

I end up having to write horrific code like:

if value and (isinstance(value,(datetime,date) or not isnan(value)):


> if you feed it something 
> that is not a numeric type, it should,

Why should it?

cheers,

Chris

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