This slide uses the
+= operator in the example, and asks the user to increment the iterator "like the example above". I was OK with that b/c I already knew the += operator, but this operator isn't explained on this slide, or anywhere before so it might confuse some people.
In the next slide "More Assignment Operators" the code is reset to use the long form
count = count + 1 as though that's the way we were asked to do it in the previous slide.
Anyway, it seems like Code Academy meant to use
count = count + 1 in The Until Loop, and then introduce the
+= operator in the next slide, More Assignment Operators. It's a small over site but I wanted to point it out in case it's confusing anyone.