[Python-Dev] eq vs hash (original) (raw)
Guido van Rossum guido at python.org
Fri Apr 4 18:08:16 CEST 2008
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On Fri, Apr 4, 2008 at 8:08 AM, Jason Orendorff <jason.orendorff at gmail.com> wrote:
On Fri, Apr 4, 2008 at 9:38 AM, Guido van Rossum <guido at python.org> wrote:
> What specific code breaks? Maybe we need to turn this into a warning > in order to be more backwards compatible? I looked at Mercurial. It doesn't use hash at all. It uses eq in two files, three total uses: http://hg.intevation.org/mercurial/crew/file/6c4e12682fb9/mercurial/commands.py http://hg.intevation.org/mercurial/crew/file/6c4e12682fb9/mercurial/context.py
If it breaks, perhaps the instances of one of those classes that define eq but not hash are used in a set or as dict keys? That's the difference between 2.5 and 2.6 in this area.
-- --Guido van Rossum (home page: http://www.python.org/~guido/)
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