# Python isnan() Function Example | Python Math Methods

Python isnan() is an inbuilt math function that is used to check whether a given input is a valid number or not. Python isnun() takes only one parameter.

Python isnan() is an inbuilt math function that is used to check whether a given input is a valid number or not. The isnan() function is under the math library, so to use this function, we first have to import the isnan() function.

### Python isnan()

The isnan() function is used to determine whether the given parameter is a valid number or not. If given number x as a parameter is a valid Python number (Positive or Negative), isnan() function returns False.

#### Syntax

``math.isnan(x)``

The math.isnan() function takes only one parameter x that is any valid data type in python.

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