Want to find contours -> ValueError: not enough values to unpack (expected 3, got 2), this appears [duplicate]

the function cv2.findContours() has been changed to return only the contours and the hierarchy and not ret

you should change it to:

contours,hierachy=cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)