title: Unable to install Numpy on AWS EC2 Python 3.6
body: <p>I have an Amazon EC2 instance running Amazon Linux and a virtual environment with python 3.6.</p>
  
  <p>I can't seem to install Numpy :</p>
  
  <pre><code>(testenv) [ec2-user@ip-xxx-xx-xx-xx venv]$ pip3 install numpy
  Collecting numpy
    Using cached numpy-1.13.3-cp36-cp36m-manylinux1_x86_64.whl
  Installing collected packages: numpy
  Successfully installed numpy-1.13.3
  
  (testenv) [ec2-user@ip-xxx-xx-xx-xx venv]$ python
  Python 3.6.2 (default, Nov  2 2017, 19:34:31) 
  [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import numpy
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ModuleNotFoundError: No module named 'numpy'
  </code></pre>
  
  <p>I also did a <code>sudo python36 -m pip install numpy</code> it did not work.</p>