Thank you for the constructive comment.

I tried to make it educational and fun :)

I agree that examples with sum and filter and not informative. Example with the group by may seem stupid, but I actually wrote it for a project :)

I know for a fact that many intermediate pandas users don’t know about function for percentage change or that it is faster to break down functions than to simply use apply.

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Senior Data Scientist, tweeting twitter.com/romanorac.

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