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It might still not work. You have to use
import cv2 import cv2.cv as cv # here import numpy as np img = cv2.imread('testimage.jpg') gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) circ = cv2.HoughCircles(gray, cv.CV_HOUGH_GRADIENT, 1, 10) # and here
OR
import cv2 import cv2.cv # here import numpy as np img = cv2.imread('testimage.jpg') gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) circ = cv2.HoughCircles(gray, cv2.cv.CV_HOUGH_GRADIENT, 1, 10) # and here