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Python cmath.isinf() Function

The Python cmath.isinf() function checks whether a given value is positive or negative infinite.

This function returns True if the specified number is infinite, otherwise it returns False.

For instance, if we have a floating point number "x = float('inf')", which represents positive infinity, i.e "True".

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

cmath.isinf(x)

This function accepts a numeric value as a parameter. Represents the floating point number to be infinity.

This method returns a boolean value, i.e., True or False.

In the below example, we are rectifying if positive infinity is infinite using cmath.isinf() function −

import cmath
x = cmath.isinf(float('inf'))
print(x)

The output obtained is as follows −

True

Here, we are checking if negative infinity is infinite using the cmath.isinf() function −

import cmath
res = cmath.isinf(float('-inf'))
print(res)

Following is the output of the above code −

True

Now, we are checking if "100" is infinite using cmath.isinf function −

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

We will 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 cmath.isinf() function −

import cmath
result = cmath.isinf(float('NaN'))
print(result)

The result is obtained as follows −

False

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