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

How can i make a string out of multidimensional music groups?

I completed the challenge joining the musical groups this way:

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

But instead of joining all the groups in their indexes, for example, "Ad Rock", "MCA", "Mike D." on musical_groups[0] , i want to join every group in 1 string so every group will be in the same place,I'm not sure where to go from here, do I need to ,in some way ,do an extra step to join each individual line into a string or something?

If somebody could write the correct code with an explanation that would be much appreciated!

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:
    final=", ".join(x)
print(", ".join(final))

1 Answer

:warning: Note that .join() is a method on a string that takes in a list, not the other way around. Confusing? I don't blame you. It's one of the strangest methods in Python.

For example...

my_list = ['a', 'b', 'c']
my_list.join(', ')  # Error!
', '.join(my_list)  # Correct


for musical_group in musical_groups:
    print(', '.join(musical_group))