Antoine Pitrou wrote:
Stefan Krah <stefan-usenet <at> bytereef.org> writes:
Are there cases where == and != are actually needed to give a result
for NaNs?

It is a common expectation that == and != always succeed. They return True or
False, but don't raise an exception even on unrelated operands:

It is a common expectation, but a false one. __eq__ and __ne__ are explicitly allowed to return anything, not just bools.

http://www.python.org/dev/peps/pep-0207/

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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