Python math.isfinite() Method

The Python math.isfinite() method is used to determine whether a given number is a finite floating-point number. It returns "True" if the number is finite, and "False" otherwise. A floating-point number is considered finite if it is neither positive nor negative infinity and not NaN.

For example, if you have a floating-point number "x = 3.14", the math.isfinite(3.14) method will return "True", indicating that 3.14 is a finite number.

Similarly, if you have a floating-point number "y = float('inf')", which represents positive infinity, the math.isfinite(y) method will return "False", indicating that is not finite.

Syntax

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

math.isfinite(x)

Parameters

This method accepts a numeric value as a parameter representing the floating-point number to be checked for finiteness.

Return Value

The method returns a boolean value (True or False) indicating whether the given value "x" is a finite floating-point number.

Example 1

In the following example, we check if the number "10.5" is a finite floating-point number using the math.isfinite() method

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

Output

The output obtained is as follows

The result is: True

Example 2

Here, we check if the number "0" is a finite floating-point number using the math.isfinite() method

import math
result = math.isfinite(0)
print("The result is:",result) 

Output

Following is the output of the above code

The result is: True

Example 3

Now, we are checking if negative infinity is a finite floating-point number using the math.isfinite() method

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

Output

We get the output as shown below

The result is: False

Example 4

In this example, we are checking if NaN (Not a Number) is a finite floating-point number using the math.isfinite() method

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

Output

The result produced is as shown below

The result is: False