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Python cmath.isnan() Function

The Python cmath.isnan() function verifies whether a value is NaN(Not a Number) or not. This function returns the Boolean value, i.e., True if the value is NaN, otherwise False.

A number "x" is said to be NaN if it doesn't represent a real number and can't be expressed as a finite value, i.e., positive or negative infinity. NaN often arises a result of undefined operations, such as taking the square root of a negative number.

Following is the basic syntax of the Python cmath.isnan() function −

cmath.isnan(x)

This function accepts a numeric value as a parameter and redirects the value to be NaN.

This function returns a boolean value which is True is the given number is Nan else it returns False.

In the below example, we are verifying if the floating point number "20.5" is "NaN" using cmath.isnan() function −

import cmath
x = cmath.isnan(20.5)
print(x)

The output obtained is as follows −

False

Here, we are rectifying if positive infinity is NaN using cmath.isnan() function −

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

Following is the result for the above code −

The result is: False

Now, when we use variable "x" to store NaN. Then this cmath.isnan() function gives positive output.

import cmath
x = float('nan')
y = cmath.isnan(x)
print(y)

We will get the output as follows −

True

In the following example, if we are passing string as the input, then this cmath.isnan() function gives TypeError.

import cmath
res = cmath.isnan("Welcome to Tutorialspoint")
print(res)

The result produced is as follows −

Traceback (most recent call last):
  File "/home/cg/root/86486/main.py", line 2, in 
    res = cmath.isnan("Welcome to Tutorialspoint")
TypeError: must be real number, not str

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