Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Introducing Lists Build an Application Multidimensional Musical Groups

Why aren't the other lists being joined?

(It was working but apparently I'm not allowed to use a nested for loop I have to use join). When I run my program only the members of the last group are being printed ("Run, "DMC" ect) but what happened to everyone else?

musical_groups = [
    ["Ad Rock", "MCA", "Mike D."],
    ["John Lennon", "Paul McCartney", "Ringo Starr", "George Harrison"],
    ["Salt", "Peppa", "Spinderella"],
    ["Rivers Cuomo", "Patrick Wilson", "Brian Bell", "Scott Shriner"],
    ["Chuck D.", "Flavor Flav", "Professor Griff", "Khari Winn", "DJ Lord"],
    ["Axl Rose", "Slash", "Duff McKagan", "Steven Adler"],
    ["Run", "DMC", "Jam Master Jay"],
# Your code here

seperator = ", "
for group in musical_groups:
    all_people = seperator.join(group)

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,404 Points

Hi Jacob Clinton, I see two issues:

  • The value of all_people is overwritten each time the loop is run.
  • the final print references group, which contains the value of group on the last iteration of the loop.

Perhaps, you meant in indent the print statement so it runs in every loop iteration, and it should print all_people instead of group.

Post back if you need more help. Good luck!!