The scripts in this repository do not by default generate output files, instead only outputting to stdout. This is quite elegant if your RSS feed reader supports reading in from stdout as it avoid the generation of intermediary files. For example, in my newsraft feeds configuration file, I have the following lines:

@ Events
$(python3 ~/code/python/custom_rss_generators/roisin_dubh_listings.py 2>/dev/null)  "  Róisín Dubh Event Listings"

However, if your RSS feed reader does not support reading in from stdout or running executables to generate feeds, you will need to find another way to utilise these scripts, e.g. generating rss.xml files on a cron schedule and reading from those in your feed reader by using the a link beginning with file:// or if possible, doing some kind of command injection attack via your configuration file to force your feed reader to execute the script (although if successful & not a deliberate design feature this likely indicates a security issue with your feed reader).