A reader recently contacted me regarding a missing file from the downloadable source for Python for Data Science for Dummies. This is the P4DS4D; 01; Quick Overview.ipynb you need for the first chapter. Simply click here to download P4DS4D; 01; Quick Overview.ipynb. I’m also asking the publisher to add the missing file to the downloadable source found on the Dummies site at http://www.dummies.com/store/product/Python-for-Data-Science-For-Dummies.productCd-1118844181,descCd-DOWNLOAD.html. If you encounter any other problems with the book, please be sure to let me know at John@JohnMuellerBooks.com. Thank you for your patience!