Mak Nazečić-Andrlon added the comment:
It's not about equality.
>>> class A: pass
...
>>> (float("nan"), A()) < (float("nan"), A())
False
That < comparison should throw a TypeError, since NaN < NaN is False, in the
same way that 0 < 0 is False here:
>>> (0, A()) < (0, A())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unorderable types: A() < A()
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<http://bugs.python.org/issue21873>
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