title: Python+OpenCV 3 - cant use SIFT
body: <p>I compiled OpenCV 3 &amp; opencv_contrib from latest source code. Installed it into site-packages folder for Python 2.7. I can follow all of the tutorials at <a href="http://docs.opencv.org/trunk/doc/py_tutorials/py_feature2d/py_matcher/py_matcher.html" rel="noreferrer">http://docs.opencv.org/trunk/doc/py_tutorials/py_feature2d/py_matcher/py_matcher.html</a> except the ones involving SIFT.</p>
  
  <p>Here is the error I get:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Projects\icu\ex01.py", line 9, in &lt;module&gt;
      sift = cv2.SIFT()
  AttributeError: 'module' object has no attribute 'SIFT'
  </code></pre>
  
  <p>Please help. I searched &amp; searched &amp; searched and cant find anything related to Opencv3.</p>
  
  <p>Oh, and I used Visual Studio 2013 to build it.</p>