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Asked: 2026-06-02T14:39:15+00:00

I stumbled upon this line of code in SciPy’s source, in the stats module

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I stumbled upon this line of code in SciPy’s source, in the stats module:

return 1.0*(x==x)

Is this return something other than 1.0? In other words, is there any value of x such that x == x holds False?

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1 Answer

  1. Editorial Team

    According to the IEEE 754 standard not-a-number (NaN) must always compare false, no matter what it is compared to.

    Python 2.7.2+ (default, Oct  4 2011, 20:06:09) 
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x=float("NaN")
>>> x==x
False
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