How to get index from itertools.product

Question

# loop through every NxN cell in the target image
    for (blk_row, blk_col) in itertools.product(xrange(0, height - 
      (cell_size - 1), cell_size), xrange(0, width - (cell_size - 1), cell_size)):

where N = cellsize, would it be valid to divide by cellsize to get an index?

Answer 1

To get the index for any iterator use enumerate :

for index, (blk_row, blk_col) in enumerate(itertools.product(
                                           xrange(0, height - (cell_size - 1), cell_size), 
                                           xrange(0, width - (cell_size - 1), cell_size))):

Answer 2

除以 cell_size 似乎有效，手指交叉。