Sorta hate yaml drive config management and deployments sytems aka ansible, saltstack, etc; so ended up writing my own that's salt-like, but all python.
But then I decided I really kind of despise "programming" in YAML (conditionals and loops in particular). So I adapted Ansible ideas to Python, in particular: idempotent commands and notifications (commands triggered later, when another set of commands make a change; like restarting apache after making a bunch of config changes).
https://github.com/mattbillenstein/salty
Been using this on a couple startups for a couple years, but it lacks polish in terms of user-friendliness.
Interesting how we came to some of the same types of things - like you have .notify() - I return a result object with a "changed" flag, etc.