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

nikel Hayo
nikel Hayo
1,942 Points
Posted by nikel Hayo
nikel Hayo
1,942 Points

how can i get rid of the first comma?

I am trying to solve this quiz with the least amount of code, but I could not figure out to make the loop without creating first comma. I do not want to delete first comma after output,as it will make the code complicated . Is there any way to re-write this code as simple as possible, directly giving the requested output?

this is the result of my code:

, 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

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"],
]
for group in musical_groups:
    joined_member=""
    for member in group:
            joined_member=joined_member+ ", " + member
    print(joined_member)

2 Answers

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

You don't need an inner loop, just use the "join" method on each group. It only places delimiters between the items joined:

    print(", ".join(group))
nikel Hayo
nikel Hayo
1,942 Points
nikel Hayo
nikel Hayo
1,942 Points

Thanks Steven it is amazing how simple the solutions are at python . At which course was this join method explained? I somehow missed that.

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

In the course you are taking now, the previous stage has a video titled Split and Join.