Yes, the remote debugger.

So in my code I have
    import pydevd; pydevd.settrace('localhost', stdoutToServer=True, stderrToServer=True)

Then I start the pydev server in Aptana.

Python version is 2.7.3

Date: Thu, 23 May 2013 13:00:12 -0300
Subject: Re: [Pydev-code] PyDev doesn't close properly

Hi Paul,

Is this in the remote debugger? 

Which Python version is used?

You can check what's keeping the process alive by printing the non-daemon threads that are currently running (i.e.: use threading.enumerate() to list the threads then print the ones are not daemon threads at the point where the application should exit -- or if it's hard to know when it should exit, you can try ).

Note that the debugger itself should only create daemon threads.