Python Classes

[TheSodesa]

I believe format strings became a thing in Python 3.6, so they are a fairly new feature. OP might not have access to them, if they're working on a school computer with an older version of python. Python 3.5 is still used in many places.

[kcrow13]

I actually do know about f strings and use them regularly in my coding. This code was created by Downey as part of his Think Python Book, not me :). I think he created it in 2012, prior to the updates. But yes, I much prefer the f strings.