title: ImportError: No module named 'cv2' Python3
body: <p>I have such a problem</p>
  
  <pre><code>(face_det) user@pc:~$ python3
  Python 3.5.3 (default, Apr 22 2017, 00:00:00) 
  [GCC 4.8.4] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import cv2
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named 'cv2
  </code></pre>
  
  <p>I don't have it on python2:</p>
  
  <pre><code>(face_det) user@pc:~$ python2
  Python 2.7.13 |Anaconda custom (64-bit)| (default, Dec 20 2016, 23:09:15) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  Anaconda is brought to you by Continuum Analytics.
  Please check out: http://continuum.io/thanks and https://anaconda.org
  &gt;&gt;&gt; import cv2
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>In spite of  the fact, that I have opencv (I've also tryed to remove it and install then):</p>
  
  <pre><code>(face_det) user@pc:~$ pip3 install opencv
  Requirement already satisfied: opencv in ./.virtualenvs/face_det/lib/python3.5/site-packages
  (face_det) user@pc:~$ conda install opencv
  Fetching package metadata .........
  Solving package specifications: .
  
  # All requested packages already installed.
  # packages in environment at /home/pc/anaconda3:
  #
  opencv                    3.2.0               np112py27_0    conda-forge
  </code></pre>