title: After install ROS Kinetic, cannot import OpenCV
body: <p>I have first installed openCV from source using this <a href="http://milq.github.io/install-opencv-ubuntu-debian" rel="nofollow noreferrer">script</a>.
  When I tested it was working well.</p>
  <p>After I installed <a href="http://wiki.ros.org/kinetic/Installation/Ubuntu" rel="nofollow noreferrer">ROS kinetic</a>, and open <code>python3</code> and run <code>import cv2 as cv</code>, got the following error:</p>
  <pre><code>Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
  [GCC 5.4.0 20160609] on linux
  Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
  &gt;&gt;&gt; import cv2 as cv
  Traceback (most recent call last):
    File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  ImportError: /opt/ros/kinetic/lib/python2.7/dist-packages/cv2.so: undefined symbol: PyCObject_Type
  </code></pre>