How can I check for NaN values?

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

You can use math.isnan(x)to check for NaN values this will Return True if x is a NaN (not a number), and False otherwise.

>>> import math 

>>> x = float('nan') 

>>> math.isnan(x) 

True