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Chelsea Yang2,982 Points
For the 2-d printout, why 2nd loop has to be inside ()
Can someone help why this way doesn't work? for group in musical_groups: for name in group: print(', '.join(str(name)));
but by placing the 2nd loop inside join() it passed for group in musical_groups: print(', '.join(str(name)for name in group));
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 group in musical_groups: print(', '.join(str(name)for name in group));
Steven Parker221,297 Points
Your first example doesn't work because it references "name", which has not been defined.
But while the generator expression works, it's more complicated than necessary since "group" is already a list of strings:
And what's with that semicolon at the end of the line? That's not Python syntax.