why does this prog return None?

Question

https://code.sololearn.com/cYj9oiQoSL2v/?ref=app

Answer 1

left you a comment on the code... 😃

Answer 2

before none it prints l1 and l2 correctly.
put then it thinks it is none

Answer 3

There's no need to print out the final result of the sumit function, as you are already printing within the function itself, therefore:

Change:
print(sumit([],ip))

to:
sumit([],ip)

Answer 4

because var is = ()
it means nothing is printing