[Python-ideas] checking for identity before comparing built-in objects

[Joshua Landau]

Just a curiosity here (as I can guess of plausible reasons myself, so there
probably are some official stances).

Is there a reason NaNs are not instances of NaN class? Then x == x would be
True (as they want), but [this NaN] == [that NaN] would be False, as
expected.

I guess that raises the question about why x == x but sqrt(-1) != sqrt(-1),
but it seems a lot less of a big deal than all of the exceptions with
container equalities.

Thanks,

Joshua
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20121009/61500174/attachment.html>