def f(a,b):
    for i in (a,b):
        s=a[1]+b[1]
    return s
print(f(['1','2','3','432'],['4','3','7','32']))

 >>>
>>> a = [1,2,3]
>>> b = [2,3,4]
>>> for i in range(len(a)):
	print a[i] + b[i],
3 5 7
>>> 

 def summ(a,b):
    out = []
    for i in range(len(a)):
        out.append(a[i]+b[i])
    return out

  
>>> def f(lst1, lst2):
...     return list(map(sum, zip(lst1, lst2)))
... 
>>> f([1, 2, 3], [10, 20, 30])
[11, 22, 33]
>>>