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math.isnan(x)

# Import math package
import math

# Check if the number is NaN
print(math.isnan(56))
print(math.isnan(-45.34))
print(math.isnan(+45.34))
print(math.isnan(math.inf))
print(math.isnan(float("nan")))
print(math.isnan(float("inf")))
print(math.isnan(float("-inf")))
print(math.isnan(math.nan))

False
False
False
False
True
False
False
True