title: importing numpy in different python versions
body: <p>I have a problem with importing numpy for python3, I'm new in coding and followed all steps.  I want to import numpy in python3 but not in python2 which is set by defaultn my mac mojave 10.14.2.</p>
  
  <p>I have Python 2.7.10 by default on my mac and can switch now to Python 3.7.2 in shell. I installed pip 18.1 as described in PyPA and now I can import numpy only in Python 2. what should I do to be able to import numpy in Python 3? Is it better to set Python 3 by default on my mac mojave 10.14.2? </p>