Iterating over 2 elements in a list but repeating the second element in the next iteration

How do I make a for loop or a list comprehension so that every iteration gives me two elements but the last value must be repeated.

l = [1,2,3,4,5,6]

for i,k in ???:
    print str(i), '+', str(k), '=', str(i+k)

Output:

1+2=3
2+3=5
3+4=7
4+5=9
...

>Solution :

You can use zip:

l = [1,2,3,4,5,6]
for i,k in zip(l, l[1:]):
    print(f'{i} + {k} = {i+k}')

Output:

1 + 2 = 3
2 + 3 = 5
3 + 4 = 7
4 + 5 = 9
5 + 6 = 11

For more explanation:

>>> list(zip(l, l[1:]))
[(1, 2), (2, 3), (3, 4), (4, 5), (5, 6)]