'FigureCanvasTkAgg' object has no attribute 'update'

[Kevin Shen]

Hi there,

I am just trying to run the first example with 2dBox. After installing the dependencies, I ran the example and it crashes with the error:

File "python/gps/gui/output_axis.py", line 68, in draw
    self._fig.canvas.update()
AttributeError: 'FigureCanvasTkAgg' object has no attribute 'update

Did I miss something in setting up the dependencies?

Thanks in advance!

[Ashvin Nair]

I found I had to switch all the

self._fig.canvas.update()

lines to

self._fig.canvas.draw()

and then it worked. Maybe a version mismatch?

[Chelsea Finn]

Can you try adding "matplotlib.use('Qt4Agg')" right below "import matplotlib" in target_setup_gui.py and gps_training_gui.py?

​- Chelsea​

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[Kevin Shen]

Thanks! That fixed it! Although I'm thinking .draw() may slow the program down a bit compared to .update()?

[Kevin Shen]

Hi Chelsea,

Thanks for your reply! Ashvin's suggestion worked. However, I tried your suggestion as well. It doesn't look like target_setup_gui.py or gps_training_gui.py imports the entire matplotlib library, so when I add "matplotlib.use('Qt4Agg')", matplotlib is not recognized as a variable. I added "import matplotlib as matplotlib" but it now complains

UserWarning:  This call to matplotlib.use() has no effect
because the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.

Would there be any reason to not go with Ashvin's fix?

Kevin

[Chelsea Finn]

Ok, I'm not sure -- I'm CC'ing Dennis, who wrote all of the GUI code.

Dennis - see below. Is replacing update() with draw() the best solution? Or is there a better solution?

Chelsea

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[Ashvin Nair]

I found 

import matplotlib

matplotlib.use('Qt4Agg')

also works but you have to put it above the imports for pyplot and other matplotlib modules as the error says.

[Chelsea Finn]

Ok. I'll push a fix to the master branch soon.

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[Chelsea Finn]

Dennis just pushed a fix.

Chelsea