title: Bandwidth throttling in Python
body: <p>What libraries out there let you control the download speed of network requests (http in particular). I don't see anything built-in in urllib2 (nor in (Py)Qt which I intend on using).</p>
  
  <p>Can Twisted control bandwidth? If not, how can I control the read buffer size of urllib2 or Twisted? <code>sleep</code>ing to suspend network operations isn't an option.</p>