sifttest1.py

import cv2
image = cv2.imread("download.jpg")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
sift = cv2.xfeatures2d.SIFT_create()
(kps, descs) = sift.detectAndCompute(gray, None)
print("# kps: {}, descriptors: {}".format(len(kps), descs.shape))