<pre>def sum_of_digits(n): if n == : return n else: return (n % 10) + sum_of_digits(n // 10) sum_of_digits(343)
n % 10
0
n // 10
if n < 10 : return n
def sum_of_digits(n): if n == : return n else: return (n % 10) + sum_of_digits(n // 10) sum_of_digits(343)
if n == 0: return n
var
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