Factorial of a number using loop and recursion in python

Python program to find the factorial of a number using for Loop

In [1]:

number = int(input('Enter a number: '))

factorial = 1

if number < 0:

    print('Not Possible! Please Enter a Positive Number')

elif number == 0:

    print('Factorial of 0 is 1.')

else:

    for i in range(1, number + 1):

        factorial =  factorial * i

print ('Factorial of: ', number, 'is: ', factorial)

​

Enter a number: 7
Factorial of:  7 is:  5040

Factorial of a Number using Recursion

In [2]:

def factorial(num): #Defining the function

    if num < 0:

        return 'Not Possible'

    elif num == 0:

        return 1

    elif num == 1:

        return 1

    else:

        return num * factorial(num - 1)

​

n = int(input('Enter a positive number: '))

res = factorial(n)

print('Factorial of: ', n, ' is: ', res)

​

Enter a positive number: 6
Factorial of:  6  is:  720