Python math.isnan() Method

Example

Check whether a value is NaN or not:

# Import math Library
import math

# Check whether some values are NaN or not
print (math.isnan (56))
print (math.isnan (-45.34))
print (math.isnan (+45.34))
print (math.isnan (math.inf))
print (math.isnan (float("nan")))
print (math.isnan (float("inf")))
print (math.isnan (float("-inf")))
print (math.isnan (math.nan))

Try it Yourself »

Definition and Usage

The math.isnan() method checks whether a value is NaN (Not a Number), or not.

This method returns True if the specified value is a NaN, otherwise it returns False.

Syntax

math.isnan(x)

Parameter Values

Parameter	Description
x	Required. The value to check

Technical Details

Return Value:	A `bool` value, `True` if the value is NaN, otherwise `False`
Python Version:	3.5

❮ Math Methods