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Afaik findContours gives you a list of contours, i.e. if you know that it gave exactly one contour, compare originalContours[0] w. drawContours[0], otherwise you can compare each possible combination, e.g.

for i in range(len(orginalContours)):
  for k in range(len(drawnContours)):
    print cv2.matchShapes(drawnContours[k],orginalContours[i],cv2.cv.CV_CONTOURS_MATCH_I1, 0.0)