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Jun 17, 2020 at 16:52 comment added Giulio Genovese When you use y in ["A", "B"] you are doing something that assumes you already know the unique contents of Y. This could be achieved using the keys() function but that is also only present in the development version and if the development version is to be used the solution with collect_by_key() is more minimalist.
Jun 16, 2020 at 20:46 review First posts
Jun 16, 2020 at 21:17
Jun 16, 2020 at 20:40 history answered Mike Lin CC BY-SA 4.0