Looks pretty cool. I like that you can do basic arithmetic in the shell, feels like something every shell should be able to do out of the box.
Anybody using it as their daily driver? Any gotchas?
At this time Xonsh can't replace bash/zsh completely because of subrpocess modules in Python are not pretty well developed (granular process management is required). But for daily usage as an interactive shell and scripting the xonsh shell is pretty cool and useful for Python developers, devops, data scientists and other users who can just read the documentation carefully.
I highly recommend start diving into xonsh from the awesome xonsh cheatsheet on Github - https://github.com/anki-code/xonsh-cheatsheet
You can do that with $(( ... ))
echo $(( 2 + 1 ))
3