To install py38-multivolumefile, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install py38-multivolumefile
To see what files were installed by py38-multivolumefile, run:
port contents py38-multivolumefile
To later upgrade py38-multivolumefile, run:
sudo port selfupdate && sudo port upgrade py38-multivolumefile
Reporting an issue on MacPorts Trac
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