.join() help

Question

On the challenge:
Here is a multi-dimensional list of musical groups. The first dimension is group, the second is group members.
Can you loop through each group and output the members joined together with a ", " comma space as a separator, please?
I'm confused about how the join function works in loops, and have tried other variations of my code attached, but I keep receiving the error:
  File "", line 13, in 
TypeError: sequence item 0: expected str instance, list found
I went back and re-watched both videos on multi-dimensional lists and the join function, as well as googled the function. I'm not sure what I'm not understanding. Please help, thanks.
```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 band in musicalgroups:
    seperator = ", "
    bands = seperator.join(musicalgroups)
    print(bands)
```

Jassim Alhatem · Accepted Answer

Hi @Randall Varasteh (https://teamtreehouse.com/randall),
You should take out the musical_groups and replace it with band. You got everything right, you just messed up with the iterable.
Your code should be:
```python
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 band in musical_groups:
    seperator = ", "
    bands = seperator.join(band)
    print(bands)
```
Check out GeeksforGeeks (https://www.geeksforgeeks.org/join-function-python/?ref=lbp). They give a very good explanation of the .join() function.

Bienvenido a la Comunidad de Treehouse

¿Buscas aprender algo nuevo?

Randall Varasteh

Randall Varasteh

Ayuda con .join()

1 Respuesta

Jassim Alhatem

Jassim Alhatem