[Python-Dev] [Python-checkins] r64424 - in python/trunk:Include/object.h Lib/test/test_sys.py Misc/NEWSObjects/intobject.c Objects/longobject.c Objects/typeobject.cPython/bltinmodule.c
Guido van Rossum
guido at python.org
Sat Jun 28 01:04:44 CEST 2008
On Fri, Jun 27, 2008 at 2:54 PM, Mark Dickinson <dickinsm at gmail.com> wrote:
> On Fri, Jun 27, 2008 at 8:02 PM, Guido van Rossum <guido at python.org> wrote:
>> Now that I've learned about the hex float format supported by C++ and
>> Java, I wonder if it wouldn't be better to support conversion to and
>> from that format and nothing else.
> This would certainly be enough for me, though I think there's still
> some educational value in having binary output available. But
> that's just a matter of substituting a four-bit binary string for
> each hexadecimal digit (or learning to read hexadecimal as
> though it were binary).
If it's educational it can be left as an exercise for the reader. :-)
> In fromhex, what would be done with a string that gives more
> hex digits than the machine precision can support? An obvious
> answer is just to round to the nearest float, but since part of the
> point of hex floats is having a way to specify a given value
> *exactly*, it might make more sense to raise an exception
> rather than changing the value by rounding it.
Whatever Java and C99 do.
--Guido van Rossum (home page: http://www.python.org/~guido/)
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