Python math.factorial() Method

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The Python math.factorial() method is used to calculate the factorial of a non-negative integer. The factorial of a non-negative integer n, denoted as n!, is the product of all positive integers from 1 to n. Mathematically, the factorial of n is calculated as −

 n! = n × (n-1) × (n-2) ×...× 2 × 1 

In other words, the factorial of n is the product of all positive integers less than or equal to n. By convention, 0! is defined to be 1.

For example −

• 5! = 5 × 4 × 3 × 2 × 1
• 4! = 4 × 3 × 2 × 1
• 0! = 1

Syntax

Following is the basic syntax of the Python math.factorial() method −

 math.factorial(n) 

Parameters

This method accepts a non-negative integer as a parameter for which the factorial is to be calculated.

Return Value

The method returns an integer value representing the factorial of the given non-negative integer n.

Example 1

In the following example, we are calculating the factorial of 5 using the math.factorial() method −

 import math result = math.factorial(5) print("The result obtained is:",result) 

Output

The output obtained is as follows −

 The result obtained is: 120 

Example 2

Here, we are calculating the factorial of 0 using the math.factorial() method −

 import math result = math.factorial(0) print("The result obtained is:",result) 

Output

Following is the output of the above code −

 The result obtained is: 1 

Example 3

In this example, we use a variable "n" to store the value "7". We then calculate the factorial of n, denoted as 7! −

 import math n = 7 result = math.factorial(n) print("The result obtained is:",result) 

Output

We get the output as shown below −

 The result obtained is: 5040 

Example 4

If we pass a non-negative integer to the factorial() method, it raises a ValueError because it only accepts integral values as an argument −

 import math result = math.factorial(5.5) print("The result obtained is:",result) 

Output

The result produced is as shown below −

 Traceback (most recent call last): File "/tmp/main.py", line 2, in <module> import user_code File "/tmp/user_code.py", line 2, in <module> result = math.factorial(5.5) ^^^^^^^^^^^^^^^^^^^ TypeError: 'float' object cannot be interpreted as an integer