Very simplistic script that will notify you when a keyword of interest has been encountered in a fresh listing.
This was not created with the purpose of being production ready. If you'd still like to use this, though, know that it uses the Gmail API. To get your Gmail API up and running, look here:
https://developers.google.com/gmail/api/quickstart/python
There's plenty to find on it online too, it isn't all that hard.
Cheers.