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how to read video from webcam with opencv3.3 and python3.5 on ubuntu 16.04?

hello i have some problem to read video from camera using pythom3 and opencv3.3 when i use python2.7 the code give me the video but when i change the interpreter to python3.5 yhe code is build but no error no result , it failt to open the camera here is the test code.

import numpy as np

import cv2

cap = cv2.VideoCapture(0)

while(cap.isOpened()): # check ! # capture frame-by-frame ret, frame =

if ret: # check ! (some webcam's need a "warmup")
    # our operation on frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('frame', gray)

if cv2.waitKey(1) & 0xFF == ord('q'):

When everything is done release the capture

cap.release() cv2.destroyAllWindows()