src/<workload>.py file

The src/<workload>.py file is an optional, standalone Python module in which you can add custom workload logic to a charm.

Charmcraft doesn’t have any requirements about the file’s contents. You can, as a common example, insert helper functions for your workload.

If you already have a Python module for interacting with your charm’s workload, you can ignore this file.

If you run the init command with either profile, Charmcraft automatically creates this file for kubernetes and machine profiles.

The name of this file depends on the name of your charm. For example, if the name of your charm is my-server-k8s, Charmcraft creates src/my_server.py.