## Factorial in python

Mathematically, the formula for the factorial is as follows. If n is an integer greater than or equal to 1, then n ! = n ( n - 1)( n - 2)( n - 3) … (3)(2)(1) If p = 0, then p ! = 1 by convention.

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

Hope this helps

Read other posts