On Wed, Apr 29, 2009 at 9:07 AM, keflavich <keflavich@gmail.com> wrote:

Since there don't seem to be any forthcoming answers, I have a somewhat
different question.  In the matplotlib FAQ, it states that using 'show()'
puts you in the GUI mainloop
(http://matplotlib.sourceforge.net/faq/howto_faq.html#use-show).  However,
using plot commands on the ipython command line does not shut down the
command line generally.  I gathered from some googling that this is because
ipython starts up the matplotlib graphics in a different 'thread', but I
don't understand how this is done and most of what I've seen says it is bad.

most GUI mainloops are blocking, so after you start them you cannot issue more commands from an interactive shell.  Either you need to run a GUI shell, or in the case of ipython run the GUI in a separate thread.  One exception to this is tkinter (tkagg), which plays nicely with a standard python shell.  I understand that recent versions of pygtk work also w/o running the mainloop in a separate thread, but I haven't dug into the details.
 

So, my question now: How can I exit the GUI mainloop without closing the
graphics windows?

This question doesn't really make sense to me.  Perhaps you can clearly describe your use case (what you need to do) rather than the proposed solutions. 

JDH