The text file data needs to be formatted so that you can access the data when you need to.
One way to do this is to create a list with a set of other lists in it. This page is explained in the video below.
I decided to make a Global List called interNatList - this list is made at the start of the program so it is Globally available in all other definitions. - See below....
Below I have opened the file and read to text one line at a time.
This is then split using the splitLines(thisString) definition and a new list is returned from the data line sent to it.
We will end up with a list containing several other lists
You may want to get rid of the /n on the end - you could do that buy using the rstrip() function. See below - where each line of text is stripped before being put into the list.