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Python Introducing Lists Build an Application Multidimensional Musical Groups

Posted by John Rey Cadut
John Rey Cadut
2,366 Points

Musical Groups

Guys I'm stuck in challenge #2: "Awesome! Now I'd like to see only groups that are trios, you know 3 members.

So can you please only print out the trios? It should still use the joined string format from task 1."

Please help me guys :(

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 musical_group in musical_groups:
    if musical_groups == 3:
        separator = ", ".join(musical_group)
        print(separator)

1 Answer

Noelle Anderson
Noelle Anderson
Treehouse Moderator 12,363 Points

You are super close. Right now this line of code: 

if musical_groups == 3:

is looking to see if your entire list is equal to the number 3, since it's using musical_groups instead of the list item parameter musical_group from your for loop. What you want instead is to look make sure that the length of the inner list (musical_group) is equal to 3.

See if you can find it from there - hope that helps!

John Rey Cadut
John Rey Cadut
2,366 Points

I've passed the challenge. Thank you Noelle. :)