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

Jorge Grajeda
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Jorge Grajeda
Python Development Techdegree Graduate 8,186 Points
Posted by Jorge Grajeda
.a{fill-rule:evenodd;}techdegree seal-36
Jorge Grajeda
Python Development Techdegree Graduate 8,186 Points

What am I missing?

I'm still having a hard time trying to understand the multi-dimensional lists sometimes especially with the loops

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"],
]

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

test(musical_groups)

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

You're getting close, here's a few hints:

  • inside the loop, you'll want to work with one group at a time instead of the entire list
  • when they said "output the members joined together" it was a hint to use the string join method
  • you don't need to create and then call a function (but you may if you prefer)
Jorge Grajeda
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Jorge Grajeda
Python Development Techdegree Graduate 8,186 Points
Jorge Grajeda
.a{fill-rule:evenodd;}techdegree seal-36
Jorge Grajeda
Python Development Techdegree Graduate 8,186 Points

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: ", ".join(musical_groups) print(group)

It says that there's 2 problems with the code and to look on the preview pane for more information but I still don't understand completely

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

You're still joining the entire list (musical_groups) instead of the current group, and you need to print the results of the join. Just doing the join by itself doesn't save the result anywhere.

And when posting code, use Markdown formatting to preserve the code's appearance and retain special symbols.