title: How to use Python's pip to download and keep the zipped files for a package?
body: <p>If I want to use the <code>pip</code> command to download a package (and its dependencies), but <em>keep</em> all of the zipped files that get downloaded (say, django-socialregistration.tar.gz) - is there a way to do that?</p>
  
  <p>I've tried various command-line options, but it always seems to unpack and <em>delete</em> the zipfile - or it gets the zipfile, but <em>only</em> for the original package, not the dependencies.</p>