title: Python: can't access newly defined environment variables
body: <p>I can't access my env var:</p>
  
  <pre><code>import subprocess, os
  print os.environ.get('PATH') # Works well
  print os.environ.get('BONSAI') # doesn't work
  </code></pre>
  
  <p>But the env var is well added in my <code>/home/me/.bashrc</code>:</p>
  
  <pre><code>BONSAI=/home/me/Utils/bonsai_v3.2
  export BONSAI
  </code></pre>
  
  <p>And I can access this env var from a new terminal.</p>