Sum of digits in a string

Question

if i just read my sum_digits function here, it makes sense in my head but it seems to be producing wrong results. Any tip?

def is_a_digit(s):
\         


        

Answer 1

Just a variation to @oscar's answer, if we need the sum to be single digit,

def sum_digits(digit):
    s = sum(int(x) for x in str(digit) if x.isdigit())
    if len(str(s)) > 1:
        return sum_digits(s)
    else:
        return s