'NaN' means "Not a number". according to Python semantics, if you try
to compare it with any other float numbers, it should return FALSE.
just like:
>>>1.0 > 'abc'
False
Since it always return FALSE, it is not a surprise for your question.
If you wish to get infinitive number, you'd use 'inf' for positive
infinitive or '-inf' for negative infinitive, from
IEEE 754 semantics, just like:
>>>a=float(6)
>>>b=float('inf')
>>>c=float('-inf')
For more information, PEP-0754 may be helpful.
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