What is a source code listing?

Prompt:

Use the feedback from your instructor on your coding exercises to make corrections to your code as needed.
Assemble complete source code listings of all programs including any corrections you had to make for each correctly functioning program.
Submit your text file(s) containing your Python code corrections for Modules 1, 2, and 3 in the Module 5 drop box.

I have made an edited all three .py program files in Idle. The problem I am having is understanding what a source code listing is. Any example I am finding shows a document with all three files combined. Is that really all it is? I just need a good example or explanation to make sure I am understanding this correctly.