I would like to write a hardcore groupby tutorial
Hello

After some thoughts, I think I would be useful for everybody if I wrote some nasty, hardcore groupby tutorial with all the crazy data manipulations I use in my code.

I work in a large company, have a phd in finance/economics and many times I pushed Pandas to the limits with 80GB datasets and others.

To do the best tutorial possible, I would be nice if someone from the community could review my tutorial and possibly improve it a bit. @TomAugspurger would you like to have a look?

Objective: making pandas better!

Thanks guys!
