How to make a checkerboard in numpy?

Question

I\'m using numpy to initialize a pixel array to a gray checkerboard (the classic representation for \"no pixels\", or transparent). It seems like there ought to be a whizzy

Answer 1

I recently want the same function and i modified doug's answer a little bit as follows:

def gen_checkerboard(grid_num, grid_size):
    row_even = grid_num/2 * [0,1]
    row_odd = grid_num/2 * [1,0]
    checkerboard = numpy.row_stack(grid_num/2*(row_even, row_odd))
    return checkerboard.repeat(grid_size, axis = 0).repeat(grid_size, axis = 1)