I am working slowly through this course, doing both the assignments and the "finger exercises" in the book. I am now on finger exercise 3.2, which gives a string of numbers separated by commas, and asks they be added togther. The book demonstrates how to do this with a string not separated by commas. The lectures have shown how to do it with a list. A string separated by commas is something I have not seen an example of. Did I miss it? Is the expectation to Google it? I don't mind doing that, I'm just wondering whether I missed something...

Question

I am working slowly through this course, doing both the assignments and the "finger exercises" in the book.  I am now on finger exercise 3.2, which gives a string of numbers separated by commas, and asks they be added togther.  The book demonstrates how to do this with a string not separated by commas.  The lectures have shown how to do it with a list.  A string separated by commas is something I have not seen an example of.  Did I miss it?  Is the expectation to Google it?  I don't mind doing that, I'm just wondering whether I missed something...