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Yeah this is true but sometimes R notebooks also refers to R studio notebooks - https://rmarkdown.rstudio.com/lesson-10.html

I think the file extension scraped on Github is only .ipynb, which is only python notebooks right?

I think most people save under this extension even if they are using a different kernel (i.e. they are running R, Julia, Matlab, etc. code in the notebook).

Yeah so its mostly a split between Jupyter and R Studio - but Jupyter can mean different languages

But the user is choosing a Jupyter Kernel upon creation and the code is run on either one of the available Kernels. No code mixing within one notebook at the current point.

I thought you could with apache toree? Maybe I misunderstand the project