Traceback (most recent call last): File "python", line 1, in <module> File "python", line 4, in find_missing IndexError: list index out of range : You are presented with two arrays, all containing positive integers. One of the arrays will have one extra number, see below:

[1,2,3] and [1,2,3,4] should return 4

[4,66,7] and [66,77,7,4] should return 77

my code:

def find_missing(arr1, arr2):  
  if len(arr1) != len(arr2):  
    for i in arr1 and arr2:  
        if arr1[i] != arr2[i]:  
          return i