project4/step_3: "bill" not defined about pycar

[tommeagher]

Jenny, sorry for the delay in responding to this. Are you saving this code in a script that you run from the command line, or are you typing them one line at a time in the interactive interpreter?
Either way, can you share your code in the lines before this? My guess is something got mistyped along the way. When I run this with python step_3_complete.py, everything works as expected.

But to your question on the "bill" variable: That's kind of an oddity of python that confused me initially. You don't need to declare that variable before you start your for loop. Using the for syntax indicates that you're about to loop through an iterator, and bill is a variable you create on the fly that refers to each item in the iterator (in this case, the objects list) each time you cycle through it. You could name it anything you want. You could call it sam or o or cheesesteak. The name doesn't really matter, provided you use that same name when referring to the individual objects in the lines that follow the for loop's start.

I hope that makes sense. Maybe @katiepark or @kevinschaul can explain it better. Either way, if you're still having trouble, share all your code in this thread, and we can help you debug it.

[jtmx]

Thanks Tom. Your explanation helped.

Yup, you're right - just a typo on my part. Now everything works.