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).

Code #1:

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# 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))

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Output:


False
False
False





 

Code #2:











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# 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'))) 



















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Output:


False
False
True






          
          
          
          

            

    

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