Change matplotlib's backend to GTK in conda env

[Xunius Xu]

Hi everyone,

I wanted to try changing my matplotlib's backend from 'Qt5Agg' (default) to 'GTKAgg', or 'GTK'. I did this by modifying

```

~/anaconda2/envs/myenv/lib/python2.7/site-packages/matplotlib/mpl-data/matplotlibrc
```

Then matplotlib complains that `Gtk* backend requires pygtk to be installed.`, although I've installed it via `conda install -c ska pygtk` and reinstalled matplotlib afterwards.

There are some similar Q&As in stackoverflow but I didn't find one regarding conda environment, and I also tried reinstall matplotlib using `pip` and it didn't help.

Lastly, I wanted to change the default backend because currently in my i3-gaps WM the matplotlib figure windows have no title bar and I can't drag them around using mouse. ‘TkAgg' has failed too, it didn't even show any image at all.

Thanks in advance!

Guangzhi

无病毒。www.avast.com

[Thomas Caswell]

Re installing Matplotlib likely over wrote your changes to the default matplotlibrc file.  You should not have to re install Matplotlib to change the back end.

See https://matplotlib.org/faq/usage_faq.html#what-is-a-backend and the looks from there for how to change the back end with out editing the conda installed files.

Tom

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