title: Pycharm not auto-completing some modules
body: <p>I was working with opencv in python. </p>
  
  <p>Whenever I use <code>import cv2</code> and then use any of the functions say <code>cv2.imread()</code> pycharm does not autocomplete the function.</p>
  
  <p>It does so for other modules. Don't know how to solve it. </p>
  
  <p>I tried <a href="https://stackoverflow.com/questions/28677670/why-isnt-pycharms-autocomplete-working-for-libraries-i-install">this</a> but am not able to find any virtual environment.</p>
  
  <p>I used <a href="https://askubuntu.com/questions/783956/how-to-install-opencv-3-1-for-python-3-5-on-ubuntu-16-04-lts">this</a> method to get pycharm working on my linux system</p>
  
  <p>&nbsp;</p>
  
  <p>Edit : I don't know if this helps but</p>
  
  <p>The path of the<code>cv2</code> module is <code>/usr/local/lib/python3.5/dist-packages/cv2.cpython-35m-x86_64-linux-gnu.so</code></p>
  
  <p>Pycharm Project interpreter path is <code>/usr/bin/python3.5</code></p>