Is this right/ what should i change?

[ralfi]

pour_list = [1,2,5,6,3,77,9,0,3,23,0.4,-12.4,-3.12]

for i in range(0, len(our_list), 2):
left = our_list[i]
right = our_list[i+1]
print("{0} - {1} = {2}".format(left, right, (left-right)))
1 - 2 = -1
5 - 6 = -1
3 - 77 = -74
9 - 0 = 9
3 - 23 = -20
0.4 - -12.4 = 12.8
Traceback (most recent call last):

File "<ipython-input-5-3f1c5e913d44>", line 5, in <module>
right = our_list[i+1]

IndexError: list index out of range



why does it keep saying list index out of range?