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Question

here is my answer
for groups in musical_groups: 
       groups = ",".join(groups)
       print(groups)
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 groups in musical_groups: 
    groups = ", ".join(groups)
    print(groups)

Jeff Muday · Answer

You are very close to the answer, nice work so far!
What Joseph is saying is this-- the join() method of the string is a sort-of virtual loop that concatenates all musical groups into a single group string with punctuation.
```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"],
]
groups = ", ".join(groups)
print(groups)
```
It is equivalent to this messier construct shown below.  There is a nice way to do it with "List Comprehensions" but that is beyond the scope of what you asked.
```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"],
]
groups = None # groups is the string to be printed, start with None
for group in musical_groups: 
    if groups is None:
        # first time through the loop
        groups = group
    else:
        groups += ', ' + group
print(groups)
```

Joseph Yhu · Answer

Remove the last line, and replace groups = ", ".join(groups) with print(", ".join(groups)).
Edit: Never mind; your way works too. Do you perhaps have trouble with the 2nd part? Because you should pass the 1st part with your solution.

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John . Meredith

John . Meredith

¿No puedo resolver esta pregunta?

2 Respuestas

Joseph Yhu

Joseph Yhu

Jeff Muday

Jeff Muday