python+OpenCV错误集锦

#最小矩形框

box = cv2.cv.BoxPoints(rect)

AttributeError: module 'cv2.cv2' has no attribute 'cv'

错误原因，这是OpenCV2的函数，在OpenCV3中改成

box = cv2.boxPoints(rect)

color(255,255,255)
NameError: name 'color' is not defined

改为 color = (255,255,255)