Why are double squared brackets used to access multiple columns in data frames?
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It's the same as regular indexing, except that the "index" is a list of values. – Primusa Feb 11 '19 at 01:45
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[This SO article](https://stackoverflow.com/questions/1169456/the-difference-between-bracket-and-double-bracket-for-accessing-the-elem?rq=1) could help you out. – Harshith Rai Feb 11 '19 at 05:24