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 Blessing Nyamayedenga
Blessing Nyamayedenga
6,283 Points

multi-dimensional list

hey guys , need help I am failing to join lists in a multi-dimensional list

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"],
]

for group in musical_groups:
    print(group + " ,")

1 Answer

Efaz Khan
Efaz Khan
5,194 Points
Efaz Khan
Efaz Khan
5,194 Points

Hi, this is how I did mine

#Task 1
all_members = []
for groups in musical_groups:
    all_members += groups

print(", ".join(all_members))

#Task 2
trios = []
for groups in musical_groups:
    if len(groups) == 3:
        trios += groups

print(", ".join(trios))