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

subhash w
subhash w
1,143 Points
Posted by subhash w
subhash w
1,143 Points

how to group the elements of the list, so that they are joined by a ","

i am trying to pront the elements of group. First I print the element after using join method. But when moving to second list in the main list, I am unable to append with the previous elements of the list. can we avoid "new-line" when printing?

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 x in musical_groups:
    print(",".join(x))

1 Answer

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,967 Points

You could do something like this:

y = ""

for x in musical_groups:
    y += ", ".join(x) + ", "

y = y[:-2]    
print(y)

if you wanted one long string of names separated by commas.

But that isn't what the challenge is asking you to do. The code you have above is what the challenge wants with the exception of one thing. The separator should be comma space instead of just a comma.