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you're halfway there already.

#sort contours
sorted_ctrs = sorted(ctrs, key=lambda ctr: cv2.boundingRect(ctr)[1])

so far, it only sorts by y position of the bbox. to sort by x and y you'd use:

sorted_ctrs = sorted(ctrs, key=lambda ctr: cv2.boundingRect(ctr)[0] + cv2.boundingRect(ctr)[1] * image.shape[1] )
# x + y * w

you're halfway there already.

#sort contours
sorted_ctrs = sorted(ctrs, key=lambda ctr: cv2.boundingRect(ctr)[1])

so far, it only sorts by y position of the bbox. to sort by x and y you'd use:

sorted_ctrs = sorted(ctrs, key=lambda ctr: cv2.boundingRect(ctr)[0] + cv2.boundingRect(ctr)[1] * image.shape[1] )
# x + y * w