
The **`math`** module in Python provides access to mathematical functions and constants. **`math.isnan()`** checks whether a value is a number or not. 

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## Usage

Suppose you want to validate records that specify the trends in inflation. `math.isnan()` will be used to check if the values entered are numbers or not. This mechanism is used largely in validating systems.

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## Syntax

---
    math.isnan(x)
---

#   
#  Arguments

`x`: The value to be checked. 

This parameter is required.

##   
## Return value

The function returns a `Boolean` value of `true` if the value is not a number, and `false` if it is a number.

#import library
import math

#initialize variables
a = 3
b = -5.6
c = math.inf
d = 9932.435
e = +57
f = 0.00004
g = math.nan

#Check whether variables are NaN 
print(a, ':', math.isnan(a))
print(b, ':', math.isnan(b))
print(c, ':', math.isnan(c))
print(d, ':', math.isnan(d))
print(e, ':', math.isnan(e))
print(f, ':', math.isnan(f))
print(g, ':', math.isnan(g))

What is math.isnan() in python?

Usage

Syntax

Arguments

Return value

Code