The math.isinf() function checks whether a given argument is an infinity. In computing, infinity usually refers to an infinitely large number or an unbounded limit. It is often used to represent values that are too large or too small to be conveniently represented in a finite number.

In Python,  Infinity is represented as  float("inf") and float("-inf") in the case of negative infinity. The math.isinf() returns True if the given argument has this value, else False.

Syntax: 
math.isinf(x)
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Where x is the number which we want to check whether it has a value of infinity.

ExampleEdit & Run
import math

print(math.isinf(float('inf')))
print(math.isinf(float("-inf")))
print(math.isinf(math.inf))
print(math.isinf(-math.inf))
print(math.isinf(float('inf') + 1000))
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Output:
True
True
True
True
True
[Finished in 0.010723259299993515s]
ExampleEdit & Run
import math

print(math.isinf(0))
print(math.isinf(1000000))
print(math.isinf(-0.00000001))
print(math.isinf(math.e))
print(math.isinf(math.pi))
 Visualize 
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Output:
False
False
False
False
False
[Finished in 0.011201863177120686s]