python cv release_模块“cv2.cv2”没有属性“cv”

链接@Spence wetjen post是针对旧的OpenCV的，在OpenCV 3.x中不起作用

这是我的代码：

环境：Python3+OpenCV 3.3#!/usr/bin/python3

import cv2

## opening videocapture

cap = cv2.VideoCapture(0)

## some videowriter props

sz = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),

int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))

fps = 20

#fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')

#fourcc = cv2.VideoWriter_fourcc('m', 'p', 'e', 'g')

fourcc = cv2.VideoWriter_fourcc(*'mpeg')

## open and set props

vout = cv2.VideoWriter()

vout.open('output.mp4',fourcc,fps,sz,True)

cnt = 0

while cnt<20:

cnt += 1

print(cnt)

_, frame = cap.read()

cv2.putText(frame, str(cnt), (10, 20), cv2.FONT_HERSHEY_PLAIN, 1, (0,255,0), 1, cv2.LINE_AA)

vout.write(frame)

vout.release()

cap.release()

结果是：