math.isnan()

In Python, the math.isnan() function returns True if the given value is NaN (not a number) and False if the value is a number.

This method belongs to the group of number-theoretic and representation functions in the math module and is used to handle simple (not complex) numbers. Except when explicitly noted otherwise, this function expects a float-type numeric value.

Syntax

math.isnan(x)

• x: The numeric value to be checked.

Example 1

In the example below, math.isnan() returns False because the variable num is a valid numeric value, not NaN:

import math

num = 20
print(math.isnan(num))

The example above results in the following output:

False

Example 2

In the example below, math.isnan() returns True because the variable nan, created using float, represents a “Not a Number” (NaN) value:

import math

nan = float('nan')
print(math.isnan(nan))

The example above results in the following output:

True

Codebyte Example

Run the following code to understand how the math.isnan() method works:

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