Question

Example:

l = [1,2,3,4,5,6,7,8,9,0]

for i in l:
    print i,l
    l.remove(i)

Returns:

1 [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
3 [2, 3, 4, 5, 6, 7, 8, 9, 0]
5 [2, 4, 5, 6, 7, 8, 9, 0]
7 [2, 4, 6, 7, 8, 9, 0]
9 [2, 4, 6, 8, 9, 0]

So why is there only 5 spins? I expect it to turn 10 times.
Can someone explain it to me step by step?

Answer 1

Notice how the printed number jumps over one number in the list? That is because, i points to a position in the list and once you delete i list “shifts” one position to the left and than when i is incremented, it in fact moves two positions to the right. So after the fifth iteration you would be in the position to the right of 0 or out of the list.