Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Introducing Lists Build an Application Multidimensional Musical Groups

Loop through a multi dimensional array

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 (var i = 0 , i < musical_groups.length , i++): print("%d", musical_groups[i])

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 (var i = 0 , i < musical_groups.length , i++):
    print("%d", musical_groups[i])

1 Answer

Steven Parker
Steven Parker
215,972 Points

This isn't Python loop syntax, are you also studying another language? Put on your "Python hat" and try again!

But also remember the instructions "Can you loop through each group and output the members joined together with a ", " (comma space) as a separator..." — the word "join‍ed" is a clue there to the name of a method you might use. :wink:

but im kinda confused though, plz giv me a hint then

Steven Parker
Steven Parker
215,972 Points

A loop in python would generally skip using an index number and iterate through the items of a list like this:

for group in musical_groups:

Where "group" would represent the current item instead of "musical_groups[i]".

thnx Steven i managed to work it out