In case you’re wondering, when I say “victim”, it’s because I’m too spoiled by the capabilities of Pandas until I meet Aggregation, Transform, Filter,
who gave me some hard time understanding the mechanisms under the hood. After devoting some time digging into it, I have a much better understanding of it. Now, let’s come straight to the point.
I always believe in the power of a simple dataset for the purpose of methods illustration. Thus, a very simple dataset will be used in this article: Population and life expectancy in different countries/regions.

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