[Python] Move JupyROOT to be private submodule of ROOT#21150
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guitargeek merged 7 commits intoroot-project:masterfrom Feb 5, 2026
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[Python] Move JupyROOT to be private submodule of ROOT#21150guitargeek merged 7 commits intoroot-project:masterfrom
ROOT#21150guitargeek merged 7 commits intoroot-project:masterfrom
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pcanal
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vepadulano
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I agree this is the right direction, LGTM! Just a small comment for consideration.
This file is not referred to anywhere in the codebase, and it also is not valid Python becayse `get_config` is defined nowhere.
This was probably left over from JupyROOT development. ROOT ships its own `kernel.json` file in `etc/notebook/kernels/root/kernel.json`.
This is not needed, as namespaces like `ROOT` are dynamically looked up by cppyy. Setting attributes of the ROOT module will only cause trouble in JupyROOT, because the `libROOTPythonization` extension is also imported there.
This cppyy import is deferred to `ROOTFacade._finalSetup(). Delaying this step avoids importing the heavy-weight cppyy machinery unless it is actually required (for example, when accessing C++ ROOT symbols), allowing Python-only ROOT submodules to be imported with minimal overhead.
JupyROOT should not be accessed by the user, and not having it as a separate package makes packaging cleaner. In the end, ROOT should only ship the ROOT package.
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JupyROOT should not be accessed by the user, and not having it as a separate package makes packaging cleaner. In the end, ROOT should only ship the ROOT package.
The PR also contains some commits to defer the import of cppyy and the initialization of the C++ runtime to the last possible moment, so we're not (partially) initializing it when importing the
ROOTmodule. This is what makes it possible to have clean Python-onlyROOTsubmodules like_jupyrootwithout the unwanted sideeffects of initializing the C++ runtime on import.