I installed cv2,when i run the code using cascade classifier class it is showing that module 'cv2' has no attribute 'CascadeClassifier'

Question

I installed opencv and i run the code for face detection using the class CascadeClassifier, but getting the error:

AttributeError: module 'cv2' has no attribute 'CascadeClassifier'

Code:

import cv2

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

please assist