Python math library | isnan() method

Python has math library and has many functions regarding it. One such function is isnan(). This method is used to check whether a given parameter is a valid number or not.

Syntax : math.isnan(x) Parameters : x [Required] : It is any valid python data type or any number. Returns: Return type is boolean. -> Returns False if the given parameter is any number(positive or negative) -> Returns True if given parameter is NaN (Not a Number).

Time Complexity: O(1)

Auxiliary Space: O(1)

Code #1:

python3

# Python3 code to demonstrate
# the working of isnan()
import math

# initializing the value
test_int = 4
test_neg_int = -3
test_float = 0.00

# checking isnan() values
# with different numbers
print (math.isnan(test_int))
print (math.isnan(test_neg_int))
print (math.isnan(test_float))

Output:

False
False
False

Code #2:

python3

# Python3 code to demonstrate
# the working of isnan()
import math

# checking isnan() values
# with inbuilt numbers
print (math.isnan(math.pi))
print (math.isnan(math.e))


# checking for NaN value
print (math.isnan(float('nan')))

Output:

False
False
True