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your code is from outdated opencv2.4, you can't use the part with the feature description / matching, api has changed.
please look at current tutorials for this.
then, you can only use SIFT or SURF if your cv2 was build with the opencv_contrib modules (xfeatures2d) and IF OPENCV_ENABLE_NONFREE=ON while building. (and no, it's OFF in the PIP version)
