Arff files are very much like CSV files except they have typing information.

Read arff files: ```

import arff for row in arff.load('example.arff'): ... x = row.hair_color ... y = row[-1] ... print(list(arff.load('example.arff'))) [[Row(hair_color='blonde', age=17.2, patno=1), Row(hair_color='blue', age=27.2, patno=2), Row(hair_color='blue', age=18.2, patno=3)] ```

Where this is the example file: @relation diabetics_data @attribute hair_color {blonde, black, blue} @attribute age real @attribute patno integer @data blonde, 17.2, 1 blue, 27.2, 2 blue, 18.2, 3

Write arff files:

```

data = [[1,2,'a'], [3, 4, 'john']] arff.dump(open('result.arff', 'w'), data, relation="whatever", names=['num', 'day', 'title']) ```

results in the creation of this file: @relation whatever @attribute num integer @attribute day integer @attribute title string @data 1,2,'a' 3,4,'john'