If you are referring to the art_maker.py program, it produces no output. In other words, it has no print statements and so prints nothing in the console window (ie. Thonny's Shell).
You should be creating a file with the size of the image on the first line of the file. Every subsequent line of the file has 6 numbers. To get the information to the file, you need to open a file for writing and then use the write function to write the information to the file.
Even though this program does not open a file for reading, it can still open a file for writing and then write to a file like you did in Lab 3 traffic_tickets.py to create the fines.txt file.
The creating of the Pointillism picture of the image is the art_viewer program.