Let's imagine you are taking a lot of pictures and modify them with one of those fancy image editors. You burned the image files to a CD, and decided to purge some of the outdated files because your hard drive is getting full. This Python code allows you to set an expiration date. Any image in a given folder or subfolder that hasn't been modified since then is destined for the bit bucket. A slight modification allows you to set other criteria like last access date, or for instance removing text files (.txt). Just be careful when you test this out.