[Python-Dev] Not-a-Number (original) (raw)
Steven D'Aprano steve at pearwood.info
Fri Apr 29 07:28:23 CEST 2011
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Robert Kern wrote:
On 4/28/11 8:44 PM, Steven D'Aprano wrote:
Greg Ewing wrote:
Taking a step back from all this, why does Python allow NaNs to arise from computations at all?
The real question should be, why does Python treat all NANs as signalling NANs instead of quiet NANs? I don't believe this helps anyone. Actually, Python treats all NaNs as quiet NaNs and never signalling NaNs.
Sorry, did I get that backwards? I thought it was signalling NANs that cause a signal (in Python terms, an exception)?
If I do x = 0.0/0 I get an exception instead of a NAN. Hence a signalling NAN.
-- Steven
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