Not sure if this is a bug or intended behavior, but I uploaded my own notebooks to try to run them on Fornax. However, when I open them by double clicking it defaults to a python3 environment instead of the heasoft environment. Is there a way to select which environment to open them in?
That is the expected behavior. If a notebook defines the kernel in its meta data and that kernel exists, it will be used, otherwise it defaults to the general python3 kernel.
As indicated in the relevant docs section, you can select the kernel from the drop down kernel menu at the top-right of an open notebook.
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