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Python math.isinf() Method

The Python math.isinf() method is used to determine whether a given number is positive or negative infinity. It returns "True" if the number is positive or negative infinity, and "False" otherwise.

For example, if you have a floating-point number "x = float('inf')", which represents positive infinity, the math.isinf(x) method will return "True", indicating that ∞ is infinite. Similarly, if you have a floating-point number "y = float('-inf')", which represents negative infinity, the math.isinf(y) method will also return "True", indicating that -∞ is infinite.

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

math.isinf(x)

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

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

In the following example, we check if positive infinity is infinite using the math.isinf() method −

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

The output obtained is as follows −

The result is: True

Here, we check if negative infinity is infinite using the math.isinf() method −

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

Following is the output of the above code −

The result is: True

Now, we are checking if the number "100" is infinite using the math.isinf() method −

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

We get the output as shown below −

The result is: False

In this example, we are checking if NaN (Not a Number) is infinite using the math.isinf() method −

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

The result produced is as shown below −

The result is: False

python_maths.htm

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