Practice - sum of digits

# Write a function to find sum of digits of a number
def digit_sum(n):
  temp = n  # store n into temp variable
  sums = 0
  while temp!=0:
    rem = temp%10   # get last digit of temp
    sums += rem     # add it to sums variable
    temp = temp//10  # modify temp at the last step
  return sums

print digit_sum(1234)
=================================================================================
# Program to find sum of digits of a given number using loop (without a function)

num = 1234
num = list(str(num)) # Convert int to list type (string first because int is not iterable)
res = 0

for digit in num:
    res += int(digit) # Convert back to int so that can do addition
print(res)