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Python math.isnan() Method

The Python math.isnan() method is used to determine whether a given number NaN (Not a Number). It returns "True" if the number is NaN, and "False" otherwise.

Generally, a number "x" is considered NaN if it does not represent a valid real number and cannot be expressed as a finite value or positive or negative infinity. NaN often arises as a result of undefined operations, such as division by zero or taking the square root of a negative number.

Following is the basic syntax of the Python math.isnan() method −

math.isnan(x)

This method accepts a numeric value as a parameter representing the value to be checked for NaN.

The method returns a boolean value (True or False) indicating whether the given value "x" is NaN.

In the following example, we check if the floating-point number "10.5" is NaN using the math.isnan() method −

import math
result = math.isnan(10.5)
print("The result is:",result)       

The output obtained is as follows −

The result is: False

Here, we check if positive infinity is NaN using the math.isnan() method −

import math
result = math.isnan(float('inf'))
print("The result is:",result)  

Following is the output of the above code −

The result is: False

Now, we use a variable "x" to store NaN. We then check if x is NaN using the math.isnan() method −

import math
x = float('nan')
result = math.isnan(x)
print("The result is:",result)  

We get the output as shown below −

The result is: True

In this example, we are checking if the integer number "100" is NaN using the math.isnan() method −

import math
result = math.isnan(100)
print("The result is:",result)  

The result produced is as shown below −

The result is: False

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