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I couldn´t open videos with Python + OpenCV

I try to open videos but I couldn't. I use this code and I try to open viedos MP4 and AVI. I don't know why but if I print the value of cap.isOpened() the returned value is FALSE.

import numpy as np
import cv2

cap = cv2.VideoCapture('test.mp4')

while(cap.isOpened()):
ret, frame = cap.read()

gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
    break

cap.release()
cv2.destroyAllWindows()