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At least on OpenCV 3.0 you can use something like:

faces = faceCascade.detectMultiScale3(
    gray,
    scaleFactor=1.1,
    minNeighbors=5,
    minSize=(30, 30),
    flags = cv2.CASCADE_SCALE_IMAGE,
    outputRejectLevels = True
)

rects = faces[0]
something = faces[1]
weights = faces[2]