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

Joshua Landau joshua.landau.ws at gmail.com
Wed Oct 10 00:13:57 CEST 2012

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

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.


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