How can I get rid of having lists inside of a list in python? - 


    def digit_sum(n):         n = str(n)         empty = [x.split() x in n]         print empty        digit_sum(21)

this code output: 

     [['2'], ['1']]

what need make it: 

    [2, 1]

so can add numbers in list together. how do that?

i (you don't need .split it, convert string on can iterate):

def digit_sum(n):     empty = [int(d) d in str(n)]     print empty

demo:

>>> digit_sum(21) [2, 1]

you add them sum() function.


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