title: ImportError: No module named bz2 for Python 2.7.2
body: <p>I'm using Python 2.7.2 on Ubuntu 11.10. I got this error when importing the bz2 module:</p>
  
  <p><code>ImportError: No module named bz2</code></p>
  
  <p>I thought the bz2 module is supposed to come with Python 2.7. How can I fix this problem?</p>
  
  <p>EDIT: I think I previously installed Python 2.7.2 by compiling from source. Probably at that point I didn't have libbz2-dev and so the bz2 module is not installed. Now, I'm hoping to install Python2.7 through</p>
  
  <pre><code>sudo apt-get install python2.7
  </code></pre>
  
  <p>But it will say it's already installed. Is there a way to uninstall the previous Python2.7 installation and reinstall?</p>