Cannot use PyPlot on apple m1 due to PyQt5 installation problem

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1

On apple m1, with julia 1.7, trying to use PyPlot fails because it is not able to install PyQt5

julia> using PyPlot
[ Info: Installing pyqt package to avoid buggy tkagg backend.
[ Info: Installing PyQt5 via the Conda pyqt package...
[ Info: Running `conda install -y pyqt` in root environment
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.

PackagesNotFoundError: The following packages are not available from current channels:

  - pyqt

Current channels:

  - https://conda.anaconda.org/conda-forge/osx-arm64
  - https://conda.anaconda.org/conda-forge/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

Searching has not yielded any solutions. This post Plotting fails on a fresh MacOS install - #2 by Alexandre_Champagne also did not help

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2

Yes I have the exact same problem. This issue was recently posted to the PyPlots GitHub page here:

Let’s hope for a quick fix because this totally shuts down my science development. I use PyPlots intensely!

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I was able to get pyqt working with PyPlots by installing pyqt via a special Conda channel:

Conda.add(“pyqt”, channel=“andfoy”)

Also it seems that conda channel robostack-experimental has pyqt for arm64… just wish I knew which channel was better or that I trusted these rare “one off” channels.

Why hasn’t Conda-forge added arm64 version of pyqt?

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4

They had one recently, because it works fine on my M1 mac with no tricks. Maybe run using Conda; Conda.update()?

You can always try a different backend by setting the MPLBACKEND environment variable.

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5

Updating conda still does not install pyqt for me. Changing backend to tkagg works but gives warning everytime

┌ Warning: PyPlot is using tkagg backend, which is known to cause crashes on MacOS (#410); use the MPLBACKEND environment variable to request a different backend.
â”” @ PyPlot ~/.julia/packages/PyPlot/XaELc/src/init.jl:198
┌ Warning: `vendor()` is deprecated, use `BLAS.get_config()` and inspect the output instead
│   caller = npyinitialize() at numpy.jl:67
â”” @ PyCall ~/.julia/packages/PyCall/L0fLP/src/numpy.jl:67

Is there a way to suppress these ?

6

There is an open pull request: https://github.com/JuliaPy/PyCall.jl/pull/950

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