gistfile1.py

// int [] = { 7, 0, 1, 3, 4, 0, 8, 0 };
// int [] = { 0, 0, 0, 7, 1, 3, 4, 8 }


def move_up(arr, startidx, endidx):
    for i in range(endidx-1, startidx-1, -1): # i [endidx, endidx-1, ... startidx]
        arr[i+1], arr[i] = (arr[i], arr[i+1])

input = [7, 0, 1, 3, 4, 0, 8, 0]
zeroidx = 0

for i in range(len(input)):
    if input[i] == 0:
        move_up(input, zeroidx, i)
        zeroidx += 1

print input
[0, 0, 0, 7, 1, 3, 4, 8]