# math.nan constant with example in Python

Python math.nan constant: Here, we are going to learn about the math.nan constant of math module with example in Python.
Submitted by IncludeHelp, on April 19, 2019

## Python math.nan constant

math.nan constant is a predefined constant, which is defined in the math module, it returns floating-point nan (Not a Number), which is equivalent to float('nan').

Note: math.nan constant is available from Python 3.5

Syntax of math.nan constant:

```    math.nan
```

Return value: float It returns a float value (nan) – that is the floating-point "Not a Number".

Example:

```    Input:
print(math.nan)

Output:
nan
```

### Python code to demonstrate example of math.nan constant

```# python code to demonstrate example of
# math.nan constant

# importing math module
import math

# printing value of nan
print("value of NaN = ", math.nan)
```

Output

```value of NaN = nan
```

Reference: Python math library

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