There is also watchexec[1]. I like the fact that is it shipped as a sinle binary, so it's pretty easy to distribute
[1]https://github.com/watchexec/watchexec
There are some big caveats to this approach. Note “Known Problems” for the library. Particularly, you need to use a polling backend for network / VM filesystems. I didn’t see any notes for the Python library and the fact that notify is still telling you this makes me suspect it will just fail to work in those cases.
https://docs.rs/notify/latest/notify