Python Program for isnan() Function

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In the previous article, we have discussed Python Program for isinf() Function
isnan() Function in Python:

The math.isnan() method determines whether a value is NaN (Not a Number).

If the specified value is a NaN, this method returns true; otherwise, it returns False.

Syntax:

math.isnan(x)

parameters:

x: This is required. It is a value to be checked.

Return Value: It returns a boolean value that is True if the value is NaN and False otherwise.

Examples:

Example1:

Input:

Given Value = -200.02
Given Value = 500
Given Value = math.nan
Given Value = math.inf
Given Value = NaN

Output:

False
False
True
False
True

Example2:

Input:

Given Value = -850.07
Given Value =  nan

Output:

False
True

Program for isnan() Function in Python

Method #1: Using Built-in Functions (Static Input)

Approach:

  • Import math module using the import keyword.
  • Give the number as static input and store it in a variable.
  • Apply math.isnan() function to the given number to check if the given number is NaN(Not a Number) or not.
  • Store it in another variable.
  • Print the above result.
  • Similarly, check for the other values and print the result.
  • The Exit of Program.

Below is the implementation:

# Import math module using the import keyword.
import math
# Give the number as static input and store it in a variable.
gvn_numb = -200.02
# Apply math.isnan() function to the given number to check if the given number
# is NaN(Not a Number) or not.
# Store it in another variable.
rslt = math.isnan(gvn_numb)
# print the above result.
print("Checking if the above given number",
      gvn_numb, "is NaN or not :", rslt)
# similarly check for the other values and print the result.
print(math.isnan(500))
print(math.isnan(math.nan))
print(math.isnan(math.inf))
print(math.isnan(float('NaN')))

Output:

Checking if the above given number -200.02 is NaN or not : False
False
True
False
True

Method #2: Using Built-in Functions (User Input)

Approach:

  • Import math module using the import keyword.
  • Give the number as user input using the float(input()) function and store it in a variable.
  • Apply math.isnan() function to the given number to check if the given number is NaN(Not a Number) or not.
  • Store it in another variable.
  • Print the above result.
  • Similarly, check for the other values and print the result.
  • The Exit of Program.

Below is the implementation:

# Import math module using the import keyword.
import math
# Give the number as user input using the float(input()) function and store it in a variable.
gvn_numb = float(input('Enter some random number = '))
# Apply math.isnan() function to the given number to check if the given number
# is NaN(Not a Number) or not.
# Store it in another variable.
rslt = math.isnan(gvn_numb)
# print the above result.
print("Checking if the above given number",
      gvn_numb, "is NaN or not :", rslt)
# similarly check for the other values
b = input('Enter some random value = ')
print(math.isnan(float(b)))

Output:

Enter some random number = 380.0006
Checking if the above given number 380.0006 is NaN or not : False
Enter some random value = nan
True

Read all the mathematical functions available in Python and understand how to implement them in your program by using the tutorial of Python Mathematical Methods Examples.