Python OpenCv cv2 equivalent for CV_FILLED

This works as expected:

cv2.rectangle(image, pt1, pt2, color, thickness=cv2.cv.CV_FILLED)

But I have not been able to find the equivalent constant in the cv2 interface. I know this is simply some negative value (from the documentation), but I like the readability of the constant in the code and would like to write the equivalent function in pure cv2.