get usb camera id automatically for opencv

get_usb_camera_id_for_opencv.py

def get_usb_camera_id():
    from subprocess import check_output
    out = check_output(["ls /dev/video*"], shell=True)
    out = out.decode('utf-8').strip().split('\n')

    if len(out) == 0:
        raise Exception('No camera Module Found')

    cam_id = None
    for dev in out:
        cmd = 'cat /sys/class/video4linux/' + dev[5:] + '/name'
        cam_name = check_output([cmd], shell=True)
        cam_name = cam_name.decode('utf-8').strip()

        if cam_name == 'DFK 33UX265':
            cam_id = dev
            print('Camera detected: {} in {}'.format(cam_name, dev))
            break

    return cam_id

DFK 33UX265 is camera name