Josh Rosenberg added the comment:
Steven: Technically, in CPython, they use both identity and equality testing,
as a function of using RichCompareBool (which tests identity first, then
equality), rather than RichCompare (which only tests equality).
It makes a difference for stuff like NaN values, where describing it as
equality only would imply that:
nan = float('nan')
([nan] * 10).count(nan)
produces 0 (because nan is equal to nothing, including itself), when in fact it
produces 10 (because we reused the same nan object, and the identity test
passed).
----------
nosy: +josh.r
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<http://bugs.python.org/issue29756>
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