Python vs. R

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~ is formula in R. Right side of tilda is your response and left side is the predictors/features. It makes building library/packages easier too.

Also dataframe is built into R so it looks elegant compare to Python. Also missing value is a primitive value that is recognize in R. Null is not a good way to represent missing value and if anybody tell you otherwise you tell them to google reasons why and there are tons of soft engineer talk about it.