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ipython 5.1 sporadically freezes when matplotlib plots are active #10201
I've using ipython 5.1 with matplotlib 1.5.1 with the Qt4Agg backend on Mac OS X 10.9.5. There have now been 3 occasions when the ipython terminal froze entirely - it would not accept control-c, control-z, or any command I tried. Quitting the Qt plot windows re-activated the python terminal.
This so far has not affected me the first or second time I've made a plot window, but eventually it seems to affect every ipython session I've started with a plot window.
I upgraded to matplotlib 2.0, and the same thing happened, but this time (now with Qt5Agg as a backend), I get a message:
After that notification, the entire terminal containing ipython became unresponsive. I think the same message was issued under ipython + matplotlib 1.5.1, but the message only appeared after closing ipython entirely, i.e.:
The code handling Qt event loop integration in terminal IPython lives here:
I don't understand what might be going wrong, though.
Where does the
I wonder if there is a race condition between triggering the
The story here would be things fail when:
From work with asyncio I have the general impression that
I suspect that the fix will be to notice when constructing the notifier fails and not starting the event loop. It might also make sense to also hook up a timer that kills the event loop after ~0.1s?