title: Numpy installation API version mismatch
body: <p>I want to install numpy, pylab, scipy, and ipython on Mac OS X Lion. I installed the following:  </p>
  
  <pre><code>python-2.7.3-macosx10.6.dmg, 
  numpy-1.6.1-py2.7-python.org-macosx10.6.dmg, 
  matplotlib-1.1.1-py2.7-python.org-macosx10.6.dmg, 
  scipy-0.11.0-py2.7-python.org-macosx10.6.dmg
  </code></pre>
  
  <p>and obtained the following messages: </p>
  
  <pre><code>/var/folders/hm/bv37669175j2dvn_f87t4zcc0000gn/T/Cleanup\ At\ Startup/statistics_intro-373260522.639.py.command ; exit;
  RuntimeError: module compiled against API version 6 but this version of numpy is 4
  Traceback (most recent call last):
  ...
      from transforms import Bbox, IdentityTransform, TransformedBbox, TransformedPath
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/transforms.py", line 34, in &lt;module&gt;
      from matplotlib._path import affine_transform
  ImportError: numpy.core.multiarray failed to import
  </code></pre>
  
  <p>Many users appear to be able to get numpy working by removing python and reinstall. I did that in <code>/user/bin</code> and <code>/Library</code>, but I still receive the error message.</p>