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your code does not make any sense.
if cv2.RETR_EXTERNALis used, you get a flat list of contours, and hierarchy is simply None. IF you would have used cv2.RETR_TREE, you would need to recursively traverse the hierarchy, your zip() attempt does not make any sense here.
also, trying a simple help(itertools.repeat) before asking would have pointed you at the problem already.
