title: Cannot import numpy with python3.5, but can import with python2.7
body: <p>I can use numpy with built in python. But with python3.5 interpreter, it says </p>
  
  <p><code>ImportError: No module named 'numpy'</code></p>
  
  <p>but when I type <code>$ sudo pip3 install numpy</code> it says </p>
  
  <pre><code>"Requirement already satisfied: numpy in /root/.local/lib/python3.6/site-packages"
  </code></pre>
  
  <p>What should I do?</p>