How does one add the digits of a large number?

Question

I have been trying to add the individual digits of a larger number for a while now, and I\'m having some trouble. I was wondering if anyone could help me.

For example, s

Answer 1

one more alternative is to use build in list([iterable]) function

bigNumber = '23455869654325768906857463553522367235'
print sum(int(x) for x in list(bigNumber))
print sum(int(x) for x in list(bigNumber)[5:11])