Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Introducing Lists Build an Application Multidimensional Musical Groups

Christopher Buckhout
Christopher Buckhout
Python Development Techdegree Student 786 Points

The **logic** of Joining and Looping the musical groups

I'm struggling to understand the "logic" as to what's missing to loop and join the musical groups together in the same list. It seems the error messages aren't of much help on this challenge. Guidance is greatly appreciated!

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"],
]
print("musical groups:")
group = []
for musical in musical_groups:
    print("* Group {}: ,".join(group))

# Your code here

1 Answer

Steven Parker
Steven Parker
208,479 Points

You don't need the empty list "group", it's "musical" that you want to join.

And the instructions ask for "the members joined together with a ", " comma space as a separator", so you should use only that instead of "* Group {}: ,".