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i suggest you to use ED_Lib which finds circles and ellipses efficiently. I want to add it in OpenCV Contrib but did not find enough time to complete yet. anyway i can help you if you want to add its source in OpenCV and use it with python.

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you can test it if you compile OpenCV adding edlib directory in modules

sample python code produces the image below:

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import cv2

img = cv2.imread('16016470376420309.jpg')
circles = cv2.testEDCircles(img)
if circles is not None: # Check if circles have been found and only then iterate over these and add them to the image
        _a, b, _c = circles.shape
        for i in range(b):
            cv2.circle(img, (circles[0][i][0], circles[0][i][1]), circles[0][i][2], (0, 255, 0), 1, cv2.LINE_AA)
            cv2.circle(img, (circles[0][i][0], circles[0][i][1]), 2, (0, 255, 0), 1, cv2.LINE_AA)  # draw center of circle
# show the output image
cv2.imshow("output", img)
cv2.waitKey(0)
cv2.destroyAllWindows()