As for Pandas to assemble a table where the cells are formed from the previous one?

I can't think of where to start. The essence - there is a table of the form:

depending on the project and the author of the review you must collect different table types:
don't know how to do this in pandas, but I think that it has something to do with grouping. I would be grateful for any advice!
June 14th 19 at 20:54

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