error while using python 3.6 and opencv-python cv2

Question

Error in using python open cv to initialize the camera in a face recognition task

import cv2
camera = cv2.VideoCapture(1)
camera.grab()
ret, frame = camera.retrieve()
cv2.namedWindow('frame')

.

OpenCV: out device of bound (0-0): 1
OpenCV: camera failed to properly initialize!

Answer 1

问题是我没有使用额外的网络摄像头，并且我的电脑只有一个摄像头，因此此行应为：camera = cv2.VideoCapture（0）