To install py38-oldest-supported-numpy, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install py38-oldest-supported-numpy
To see what files were installed by py38-oldest-supported-numpy, run:
port contents py38-oldest-supported-numpy
To later upgrade py38-oldest-supported-numpy, run:
sudo port selfupdate && sudo port upgrade py38-oldest-supported-numpy
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