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if you're using opencv3:

>>> help(cv2.findContours)

findContours(...)
 findContours(image, mode, method[, contours[, hierarchy[, offset]]]) -> image, contours, hierarchy

i'd say, cv2.findContours(....)[0] is wrong, and that it has to be: cv2.findContours(....)[1] instead.

if you're using opencv3:

>>> help(cv2.findContours)

findContours(...)
 findContours(image, mode, method[, contours[, hierarchy[, offset]]]) -> image, contours, hierarchy

i'd say, cv2.findContours(....)[0] is wrong, and that it has to be: cv2.findContours(....)[1] instead.