python opencv cv2.waitkey error

i'm trying to test the following code of the getting started page: ``` import numpy as np import cv2 img = cv2.imread('test.jpg', 0) cv2.imshow('image', img) cv2.waitkey(0)&0xFF cv2.destroyAllWindows() ``` But i got this error: ``` init done opengl support available Traceback (most recent call last): File "showimg.py", line 5, in <module> cv2.waitkey(0)&0xFF AttributeError: 'module' object has no attribute 'waitkey' Violación de segmento ``` I executed the examples that comes with the opencv installation, and they run correctly. Also, the last example that use the Matplotlib works fine. ¿Any idea of the error?, ¿any suggestion?