Answers for "how to define a factorial function in python"

factorial in python

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)
n=int(input("Input a number to compute the factiorial : "))
print(factorial(n))

factorial in python

def fact(n):
  return 1 if (n==0 or n==1) else n*fact(n-1)
fact(3)