title: unable to edit .py files in vim after Mavericks OS upgrade
body: <p>I' ve recently installed Mavericks OS X.
  Since then I am unable to manipulate a .py file using vim.
  I can use <code>vi some_filename</code> as usual, but when I run <code>vi some_filename.py</code> I get the following error in the terminal:</p>
  
  <pre><code>"some_filename" [New File]ImportError: No module named site.
  </code></pre>
  
  <p>The weirdest thing is that the next line (Prompt) is intended far to the right, nothing of what I am typing is visible and after I press the return key the next prompt is intended even further to the right of the screen.</p>
  
  <p>I use Canopy distribution as my default Python environment so maybe the issue has something to do with this fact</p>