[Matplotlib-users] FigureCanvasQTAgg clean up

[Mads I. <mad...@gm...>]

Hi,

I spend some time writing up the question below on Stackoverflow which 
immediately was closed as a duplicate of other posts. To my best 
knowledge, these posts did not answer my questions - so I'll try my luck 
here instead:

I am using the qt backengine for setting up a QWidget that embeds a 
matplotlib scene. When the widget is closed it appears that many of the 
matplotlib objects that were part of the plot still are alive in Python 
space.

My question is basically the following: What actions should I take to 
clean up the figure and axes objects etc. that were part of the plot 
widget? The qt backend comes with a figure manager, but it appears a 
little unclear how it should be used.

I have attached a small unit test example that sets up a plot. When the 
plot appears, just close it, and the test will garbage collects the 
plot, and then display info of the matplotlib objects that are still 
alive in Python space. Clearly both the path of the plot, and several 
Bbox objects are still referenced.

Our current unit test suite contains almost 10000 GUI tests and its 
imperative that proper object space clean up is done after each test. 
Any help is much appreciated.

Best regards,

Mads

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+-----------------------------------------------------+
| Mads Ipsen                                          |
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