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Python | math.factorial() function
• Last Updated : 11 Mar, 2019

In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. `math.factorial()` function returns the factorial of desired number.

```Syntax: math.factorial(x)

Parameter:
x: This is a numeric expression.

Returns:  factorial of desired number.```

Code #1:

 `# Python code to demonstrate the working of factorial()``   ` `# importing "math" for mathematical operations ``import` `math ``   ` `x ``=` `5``   ` `# returning the factorial``print` `(``"The factorial of 5 is : "``, end ``=``"") ``print` `(math.factorial(x))`
Output:
```The factorial of 5 is : 120
```

Code #2:

 `# Python code to demonstrate the working of factorial()`` ` `# importing "math" for mathematical operations ``import` `math `` ` `x ``=` `5``y ``=` `15``z ``=` `8`` ` `# returning the factorial``print` `(``"The factorial of 5 is : "``, math.factorial(x))``print` `(``"The factorial of 15 is : "``, math.factorial(y))``print` `(``"The factorial of 8 is : "``, math.factorial(z))`

Output:

```The factorial of 5 is :  120
The factorial of 15 is :  1307674368000
The factorial of 8 is :  40320```

Code #3: Throws ValueError if x is not integer

 `# Python code to demonstrate the working of factorial()``   ` `# importing "math" for mathematical operations ``import` `math ``   ` `# when x is not integer``print` `(``"math.factorial(13.7) : "``, math.factorial(``13.7``))`

Output:

`ValueError: factorial() only accepts integral values`

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