I don't know how to figure this out.

Hello Yusuf,

Yes, your instinct is correct, you do need to join these! So your next step would be to look up the join function, which you've already seen in an earlier course video. The format for that is:

"string_that_goes_in_between_the_items".join(list_of_items_to_be_joined)

I think you can figure it out from here, since you already set up an iteration through each group in the list of groups. Each group is a list (of people). The items (people) in each group list are what you want to join together. The challenge already tells you that you should have ", " between the items, so you just need to plug everything into the template above.

Generally speaking, if it's a struggle to figure out what the code needs to be for a particular problem, there are a few tips that might help you figure out the problem.

• Try writing out the code in words first - this is known as pseudo-code. For example, the pseudo-code for the problem above might look like:

For each band in list of bands:
    Join them together with ", " in between each person in the band.
    Print the string above.
    ^^ (These two can be done in one line of code but I separated them out to make it simpler.)

This is a pretty simplistic example, but for more complex programs, it can be a life saver. If you can't describe in regular words what you're trying to do, you won't really know what you need to do with your code either.

• If you know what you need to do but forget the syntax in the programming language (this happens to everyone), try looking up the syntax online. This could be in the official documentation for Python, or you could just google something like "Python join function", and all kinds of tutorials pop up - these can be really helpful.

• Along those same lines, try taking notes by hand as you go through the Treehouse videos, if you aren't already. (I know, this is super old-school! :-)) You will have an easy-to-find record of what you just learned, and the process of physically writing it out is a much more active way of learning and retaining than just watching a video. I know I've referred to my notes a LOT and it's been really helpful.

Anyway, I hope this helps. Good luck with solving this challenge, and the next ones!