Portably generating infinity and NaN
cam.ac.uk at mh391.invalid
Sat Apr 14 02:15:50 CEST 2007
skip at pobox.com wrote:
> >> (Note the absence of a demonstration on Windows.) Can't the above be
> >> blessed as the One True Way and wormed around in floatmodule.c for
> >> those platforms where float'ing "NaN" or "Inf" doesn't currently
> >> work?
> Martin> How would you do the worming-around?
> I don't know. On I was just asking. On unixoid systems I sort of assume
> you could add tests to the configure script to detect what worked. If
> converting the strings works you're done. If not, maybe Robert Kern's numpy
> code could be run in the configure script to generate constants for NaN and
> Inf that could be used in floatmodule.c. Windows would probably have to be
> hard-coded, but except for 32-bit and 64-bit differences it should be the
> same all over, yes?
If you're going to change CPython to do this, I think adopting PEP 754,
and using the fpconst module would be better than changing how float()
works when called on string literals. The only thing I don't like about
it is the camelcasing of the functions.
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