title: RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9
body: <p>I'm going through the API tutorial on New Coder (<a href="http://newcoder.io/api/" rel="noreferrer">this one</a>) and got the following error when I try to run the program:</p>
  
  <pre><code>RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9Traceback (most recent call last):
    File "api.py", line 7, in &lt;module&gt;
  import matplotlib.pyplot as plt
    File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 27, in &lt;module&gt;
  import matplotlib.colorbar
    File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/colorbar.py", line 32, in &lt;module&gt;
  import matplotlib.artist as martist
    File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/artist.py", line 12, in &lt;module&gt;
  from .transforms import Bbox, IdentityTransform, TransformedBbox, \
    File "/home/crash/TestEnv/venv/local/lib/python2.7/site-packages/matplotlib/transforms.py", line 39, in &lt;module&gt;
  from matplotlib._path import (affine_transform, count_bboxes_overlapping_bbox,
  ImportError: numpy.core.multiarray failed to import
  </code></pre>
  
  <p>I know it isn't my code because I tried running it with the example code too and had the same issue. One answer I saw suggested on here was to try Numpy 1.8, but that didn't work either.</p>
  
  <p>Also, all of this is set up within a virtual environment as directed so I don't think it's an issue of what I have installed elsewhere.</p>