Determine the sum of al digits of n

def sum_of_digits(n): 
	sum = 0
	while (n != 0): 
		sum = sum + int(n % 10) 
		n = int(n/10) 
	return sum

Here is what the above code is Doing:
1. We have a while loop that runs until n is equal to 0.
2. We add the last digit of n to the sum.
3. We divide n by 10 to remove the last digit.
4. We repeat the process until n is equal to 0.

We can also use recursion to solve this problem.