Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Basics (Retired) Putting the "Fun" Back in "Function" Functions

Andrew Macfarlane
Andrew Macfarlane
463 Points

Stuck after first line. I have def add_list(a,b,c): as my first line of code but I'm unsure what to do after that.

Hey I've looked at this for a while now so any help would be greatly appreciated. I know the syntax I need to use to start the function I just don't know how to plug in numbers for the variables I created and I have no Idea why I would need a for loop for this exercise.

functions.py
# add_list([1, 2, 3]) should return 6
# summarize([1, 2, 3]) should return "The sum of [1, 2, 3] is 6."
# Note: both functions will only take *one* argument each.
def add_list(a,b,c):
  summarize = a+b+c

2 Answers

Logan R
Logan R
22,989 Points

Your problem is that you assumed they would enter in the list manually but really they are passing in a list, so instead you should change your arguments to take in a list.

def add_list(list):
    summarize = 0
    # A for loop that loops through all of the items in the list and adds each one to summarize
    return summarize

Hopes this helps you out!

Here is what I did. Tell me if It works

'' def add_list(arg): return sum(arg)