10000 Python version specific matplotlibrc · Issue #10376 · matplotlib/matplotlib · GitHub
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Python version specific matplotlibrc #10376

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rmccampbell opened this issue Feb 4, 2018 · 5 comments
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Python version specific matplotlibrc #10376

rmccampbell opened this issue Feb 4, 2018 · 5 comments
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Difficulty: Hard https://matplotlib.org/devdocs/devel/contribute.html#good-first-issues New feature topic: rcparams

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@rmccampbell
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Bug report

Bug summary

There should be a way to use different config files for different python versions, or at least specify different backends for different versions. I have PyQt5 installed for python3, so I prefer to set my backend to Qt5Agg. But occasionally I want to run something in python2 for testing or compatibility purposes. I don't want to waste time and space installing PyQt5 on python2, so I want the backend to stay TkAgg. A workaround is to change the config files in the matplotlib installation, but these will be overwritten on the next install.
@QuLogic
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QuLogic commented Feb 4, 2018

You could use the MPLBACKEND environment variable to do that, e.g., if you're using bash, then alias pympl2='MPLBACKEND=TkAgg python2' could work.

@rmccampbell
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I'm on windows (I could accomplish the same with a bash script) but I would much rather avoid using aliases if possible. By the time I remember I forgot to use the alias I might as well just call mpl.use('TkAgg').

@tacaswell tacaswell added this to the v3.0 milestone Feb 4, 2018
@tacaswell tacaswell added topic: rcparams New feature Difficulty: Hard https://matplotlib.org/devdocs/devel/contribute.html#good-first-issues labels Feb 4, 2018
@tacaswell
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This would fit with in @anntzer 's advocacy to have the configuration just be a python script.

With our current system this would be a pretty big jump in complexity.

@anntzer
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anntzer commented Feb 5, 2018
  1. Backend switching #9795 would also solve (in another manner) the OP's problem.
  2. You can put a matplotlibrc in the site-packages folder (which is different for each Python version) although it's a bit of a hack (see docs).
  3. As mentioned by Tom, pure Python mplrcs would also make this trivial.

@dstansby dstansby modified the milestones: v3.0, needs sorting Jul 26, 2018
@timhoffm
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The original use-case has become obsolete due to dropping of Python 2 support. Please reopen if this is still a desirable feature.

@story645 story645 removed this from the future releases milestone Oct 6, 2022
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Difficulty: Hard https://matplotlib.org/devdocs/devel/contribute.html#good-first-issues New feature topic: rcparams
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