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DescriptorExtractor_create and FeatureDetector_create not found with opencv 3.0.0-dev and python3

Hello everybody, I'm using opencv 3.0.0-dev and python3 and I'm learning how to use BOW. I found an useful example here but there is some modules that not work...

For example the line cv2.DescriptorExtractor_create("SIFT")

Generate the following error: AttributeError: 'module' object has no attribute 'DescriptorExtractor_create'

But BOWKMeansTrainer() and BOWImgDescriptorExtractor() are included so I don't undestand why only the descriptor extractor (and also FeatureDetector) are missing! Any suggest? Thank you for help!