Wow! How did I miss this structure in Python in all the years I've worked with Python? Oh. I remember. Because it took so long for me move from Python 2 to P

Wow! How did I miss this structure in Python in all the years I've worked with Python? Oh. I remember. Because it took so long for me move from Python 2 to Python 3. So I'm catching up. Anyway, I enjoyed this article mostly because it jumped right into what it was for. It often takes articles just like this one to alert folks like me to one of the more interesting tools the language has to offer. I happen to have a number of projects I have to make changes to that might benefit from this structure. So kudos!