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scikit-learn tip number one using column transformer to apply different pre-processing to different columns so this is a very common need and column transformer just makes it highly convenient specifically for selecting from a data frame and specifically for selecting columns by name so this is new in scikit learn .20 and in the example weve got here a four column data frame called x and were going to go down and do some imports and create some instances of one hot encoder and simple computer and well talk in a second what those do and then here is the heart of the tip its about using column transformer specifically the make column transformer function and were going to pass it two tuples the first tuple is this one the second tuple is this one and then well pass it one more argument so the first tuple is about one hot encoding embarked in sex so those are categorical columns were gonna one hot encode them which is the same as dummy encoding and there are three possible values