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

Try to execute:

math.isnan(x)

This will return True if x is a NaN (not a number), otherwise it will retutn False.

>>> import math

>>> x = float('nan')

>>> math.isnan(x)

True

To know more about this you can have a look at the following video:-