isinf() to check number is positive or negative infinity or not in Python

isinf()

isinf(number) returns Boolean , True if the input number is positive infinite or negative infinity, False otherwise.

isinf(n)

Example

import math
print(math.isinf(2))     # False
print(math.isinf(-2))    # False
print(math.isinf(0.0))   # False
print(math.isinf(0/1))   # False
print(math.isinf(0.0/1)) # False

Note : 0.0 is considered finite.

import math
print(math.isinf(float('inf')))   # True
print(math.isinf(float('-inf')))  # True
print(math.isinf(float('nan')))   # False

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