SHOCK: WHY None?

[n00m]

def f(i,sm):
    if i+1==len(a):
        print sm+a[i]
        return sm+a[i]
    else:
        f(i+1,sm+a[i])

a=[1,2,3,4,5]

print f(0,0)




>>>
15
None
>>>

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