In our ongoing series, the AIO Data Science teams publish tutorials that go along with AIO on GitHub. Today, aioneer Maryam introduces read_and_write. This function is necessary because often, CSV files provided by clients contain bad_lines. These are lines with too many fields, like, for instance, too many commas. As a result, these CSV files cannot be read by Qlick, so they need to be cleaned. Doing this one by one would be very time-consuming. Secondly, sometimes it is necessary to combine data files if we receive data in several files or sheets. These need to be concatenated. It would be great to be able to do this in a simple function. In the tutorial, Maryam shows you how to do this!