title: Python OpenCv cv2 equivalent for CV_FILLED
body: <p>This works as expected:</p>
  
  <pre><code>cv2.rectangle(image, pt1, pt2, color, thickness=cv2.cv.CV_FILLED)
  </code></pre>
  
  <p>But I have not been able to find the equivalent constant in the <code>cv2</code> interface.  I know this is simply some negative value (<a href="http://docs.opencv.org/modules/core/doc/drawing_functions.html?highlight=rectangle#cv2.rectangle" rel="noreferrer">from the documentation</a>), but I like the readability of the constant in the code and would like to write the equivalent function in pure <code>cv2</code>.  </p>