Description of the problem

Currently calling something like this at the top of your notebook

dataset = pm.Dataset('JuDo1000', path='data/JuDo1000')
dataset.download()

will lead to extracting the archives everytime again.

This was implemented this way before as it was the simplest way without checking that all data was correctly extracted.

Of course calling

dataset = pm.Dataset('JuDo1000', path='data/JuDo1000')
dataset.download(extract=False)

would handle this, but we would need to change the notebook for that.

Description of a solution

It would be much nicer to have some kind of detection in place to check if the dataset archives were already extracted.

There we would need to check at least if all files were extracted.
I personally would feel safer if there would also be some checking if the contents were extracted correctly, because it could be that the extraction was aborted during the last file. In such a case we would have no chance in getting a waning without checking the checksums / contents of each file.