unable to answer question

try with following:

# 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(number):
  return sum(number)
def summarize(mylist):
  return "The sum of {} is {}".format(str(mylist), add_list(mylist))

what's the task?

Kent,

The solution posted by Melihmucuk is accurate. I just wanted to add a little more to it. First, you want to define the function that they are asking for, add_list(). Define this function and have it take just a single argument just like the comments in the text editor state. There is a sum() method that can be used to get the sum of the list. Melihmucuk shows this in the second line of his add_list() function.

As for the second function, summarize()...you define the function first. The second line uses the return command with a call to the format() method for the two items we want to be dynamically returned. We use the {} curly braces so that we can dynamically create a string that is returned rather than hard code a string that may or may not reflect the actual sum of the list. This could be confusing to end users if we hard coded values in a string and they are not seeing results consistent with their input (NOTE: no input required for this code challenge, but mentioning just for the bigger picture).

Let me know if you have any other questions.

Kris