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jackyj
9,969 PointsHow do you swap the value between two lists?
Stuck in this part of the "Challenge Task". I am not sure what is it asking. What would be the best way to approach this situation.
full_name = "Joa Angelo"
name_list = full_name.split()
greeting = "Hi, I'm Treehouse"
greeting_list = greeting.split()
1 Answer
Chris Freeman
Treehouse Moderator 68,441 PointsInstead of swapping, the challenge is asking to replace an item in one list with the value of a second list. The second list is unchanged, so "swapping" isn't precisely the correct work. (coders tend to be overly precise!)
To replace the third (or 2nd-index) item in greeting_list with the first (or 0th-index) item in name_list use:
greeting_list[2] = name_list[0]
Advanced feature: If you truly wanted to swap them you could use the tuple pack/unpack method you'll see later in the course:
greeting_list[2], name_list[0] = name_list[0], greeting_list[2]
This forms a tuple of the original values on the right-side of the equals sign, then unpacks these values into the variables on the left-side of the equals sign. It's the comma that makes the tuples happen. This is equivalent to:
greeting_list[2], name_list[0] = (name_list[0], greeting_list[2])
The parens are optional.