For this chapter, I will be using three datasets. The first of these, scf_extract.json, is the output from the Chapter 3, Reading, Exploring, and Modifying Data - Part I, exercise. The second, artificial_roads_by_region.csv, is a fabricated dataset containing the total road length of all of the roads in different made-up regions. The third dataset is an XML file containing the search results for Wikipedia articles about data wrangling. This data was obtained from the Wikipedia search API--details are provided along with the dataset. All datasets can be retrieved from the data folder in the external resources at https://goo.gl/v4dLc3. The data should be placed in the data/input_data folder of this chapter's project directory.