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

Posted by Benedict Ojuolape
Benedict Ojuolape
1,834 Points

Im not sure what I'm doing wrong here. Please advise. Thank you!

I'm having trouble having the programme running through each row of the multidimensional list in order to print out the groups with 3 members.

Can you let me know where I'm going wrong here?

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
group = 0
for group in musical_groups:
    if group == 3:
        print(", ".join(group))

1 Answer

Steven Parker
Steven Parker
231,248 Points
Steven Parker
Steven Parker
231,248 Points

It's not the group itself you want to test, but the size of the group.

You can get the size of an iterable by using the "len()" function on it.

Also, you don't need to preset the value of "group" before the loop.

Benedict Ojuolape
Benedict Ojuolape
1,834 Points

Amazing! Thanks Steve!