How can I check for NaN in Python

Question

float('nan') results in Nan (not a number). But how do I check for it? Should be very easy, but I cannot find it

Answer 1

math.isnan()

Checks if the float x is a NaN (not a number). NaNs are part of the IEEE 754 standards. Operation like but not limited to inf * 0, inf / inf or any operation involving a NaN, e.g. nan * 1, return a NaN.

New in version 2.6.

>>> import math
>>> x=float('nan')
>>> math.isnan(x)
True
>>>

Hope this helps!!

If you need to learn more about Python, It's recommended to join Python Programming course today.

Thanks!