.

Not a kata issue, it's a problem with your code, read this

You have to return the recursive call to your function too.

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Hi, I have an issue with "Sum of Digits / Digital Root" question, I believe my code is correct, but it won't let me through (says "None should equal 6"), my prints are showing I'm reaching exactly that, would appriciate your input :)
def digital_root(n):
str_num_arr = split_num(str(n))
print(str_num_arr)
sum = 0
for num in str_num_arr:
sum = sum + int(num)
print(f"sum is now {sum}")
if len(str(sum)) == 1:
print(f"len is now 1 for {sum}")
return sum
else:
print(f"sum len is different than 1, sum is {sum}")
digital_root(sum)

def split_num(num):
return [digit for digit in num]