Sum of consecutive pairs in a list including a sum of the last element with the first

List2 = [List1[i] + List1[(i+1)%len(List1)] for i in range (len(List1))]

[List1[i] + List1[(i+1) % len(List1)] for i in range(len(List1))]

[sum(tup) for tup in zip(List1, List1[1:] + [List1[0]])]

[x + y for x, y in zip(List1, List1[1:] + [List1[0]])]

Because of the i+1, the index goes out of range

List1 = [1,3,5,6,8,7]
List2 = [List1[i-1] + List1[i] for i in range (len(List1))]

print (List2)

This way kinda works
Result:

[8, 4, 8, 11, 14, 15]

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