[Python-Dev] == on object tests identity in 3.x (original) (raw)

Anders J. Munch 2014 at jmunch.dk
Tue Jul 8 16:58:33 CEST 2014

Chris Angelico wrote:

This is off-topic for this thread, but still... The trouble is that your "arguably just as wrong" is an indistinguishable case. If you don't want two different calculations' NaNs to ever compare equal, the only solution is to have all NaNs compare unequal For two NaNs computed differently to compare equal is no worse than 2+2 comparing equal to 1+3. You're comparing values, not their history.

You've prompted me to get a rant on the subject off my chest, I just posted an article on NaN comparisons to python-list.

regards, Anders

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