isnan(number) returns Boolean , True if the input number is NaN ( Not a Number ), False otherwise.

import math
print(math.isnan(2))     # False
print(math.isnan(-2))    # False
print(math.isnan(0.0))   # False
print(math.isnan(0/1))   # False
print(math.isnan(0.0/1)) # False  
Note : 0.0 is considered finite.
import math
print(math.isnan(float('inf')))   # False
print(math.isnan(float('-inf')))  # False
print(math.isnan(float('nan')))   # True

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