On Arch Linux I use an old -git package, which includes the "add event_state_mask and symbols to binding info" commit, and it works well. Tonight I built a Void Linux package v2.0.1, and it crashes for me on the 'binding' event again. For now no idea what's happening. On i3 everything works well.

The binding event works fine for me.

Strange... I'll try to take a closer look on Arch tonight.

Alright, there was a mess in virtual environments. After cleaning it up, I'm having some other difficulties with my code, but the binding event does not crash any longer. Sorry for my mistake.

When running under i3, i3ipc.Connection().get_tree() returns a single object representing the root container. When used under sway, get_tree() returns a linear list of all containers (root, workspaces, windows). Using i3ipc version 2.2.1-1 under Arch in both cases. No mention in the docs that get_tree() might behave differently under i3 and sway.

Never mind, it was an issue with a 3rd-party library, not i3ipc-python. Sorry.