[Python-Dev] Caching float(0.0)
"Martin v. Löwis"
martin at v.loewis.de
Tue Oct 3 19:55:43 CEST 2006
skip at pobox.com schrieb:
> If C90 doesn't distinguish -0.0 and +0.0, how can Python? Can you give a
> simple example where the difference between the two is apparent to the
> Python programmer?
Imagine an application that reads floats from a text file, manipulates
some of them, and then writes back the complete list of floats. Further
assume that somehow, -0.0 got into the file. Currently, the sign
"round-trips"; under the proposed change, it would stop doing so.
Of course, there likely wouldn't be any "real" change to value, as
the sign of 0 is likely of no significance to the application.
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