Python math.isinf() – Check if Number is Infinity

Python math.isinf()

math.isinf(x) function returns True if x is either positive infinity or negative infinity, and False otherwise.

Syntax

The syntax to call isinf() function is

math.isinf(x)

where

Parameter	Required	Description
x	Yes	A numeric value.

Examples

1. Check if positive infinity is infinity

Assign x with positive infinity, and programmatically check if x is infinity value, using math.isinf().

Python Program

import math

x = math.inf
result = math.isinf(x)
print('isinf(x) :', result)

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Output

isinf(x) : True

2. Check if negative infinity is infinity

Assign x with negative infinity, and programmatically check if x is infinity value, using math.isinf().

Python Program

import math

x = -math.inf
result = math.isinf(x)
print('isinf(x) :', result)

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Output

isinf(x) : True

3. Check if integer 8 is infinity

Assign x with a finite value, like 8, and programmatically check if x is infinity value, using math.isinf().

Python Program

import math

x = 8
result = math.isinf(x)
print('isinf(x) :', result)

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Output

isinf(x) : False

Summary

In this Python Math tutorial, we learned the syntax of, and examples for math.isinf() function.