opencv-3.2.0-vc14 with python 2.7.13

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I am a beginner in trying this, I have some problems when trying SIFT and SURF feature matching using OpenCV-3.2.0-vc14 and python 02/07/13. I make this code in pycharm and there is an error:

Traceback (most recent call last): The file "C: /Python27/Project/Test3/SIFT_1.py", line 13, in <module> shift = cv2.xfeatures2d.SIFT_create () AttributeError: 'module' object has no attribute 'xfeatures2d'

I do not know how to handle it, and for those who know to handle it gave me a tutorial, please help me thank you.