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! While you're at it, check out some resources Treehouse students have shared here.

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

My code for "introducing lists" isn't running.

The output is "expected str instance list found". can someone help? thanks.

groups.py
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
for musical_group in musical_groups:
    toline = ", ".join(musical_groups);
    print(toline);

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points

Hey Brendan Dzeguze, are SO close!

You need to join the loop variable musical_group and not the whole data group musical_groups

Also, Python does not use the semi-colons to end a line. In this case, they are harmless, but best to remove them.

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