How do I calculate the factorial of a number in Python?

How do I calculate the factorial of a number in Python?

You can calculate the factorial of a number in Python using the math module. For example, math.factorial(n) where n is your number.

Can you show me a code example?

Sure! Here's a simple example:

import math

number = 5
result = math.factorial(number)
print(f'The factorial of {number} is {result}')

What if I want to calculate it without using the math module?

You can use a recursive function. Here's an example:

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

print(factorial(5))

Is there an iterative way to do it?

Yes! Here's an iterative approach:

def factorial(n):
    result = 1
    for i in range(1, n + 1):
        result *= i
    return result

print(factorial(5))