def generate_index(n, step=2):
    for i in range(0, n, step):
        yield (i, i + step) if i + step < n else (i, None)


lst = [1, 2, 3, 4, 5, 6, 7]
for i, j in generate_index(len(lst)):
    print(tuple(lst[i: j]))

结果

(1, 2)
(3, 4)
(5, 6)
(7,)

python3

>>> x=[1,2,3,4,5,6,7]
>>> [tuple(x[i:i+2]) for i in range(0,len(x),2)]
[(1, 2), (3, 4), (5, 6), (7,)]