That was my reaction too ! Most of this is not useful at all for a day to day job. But then I re-read the OP question, and he asks indeed about learning Python

That was my reaction too ! Most of this is not useful at all for a day to day job. But then I re-read the OP question, and he asks indeed about learning Python 'in detail' - what's going on under the hood. Then I spend some time researching those questions, and it's pretty interesting !