# Python launcher: prefer `py` (Windows launcher), fallback to `python3`
export def py [...rest: string] {
    if (which ^py | is-not-empty) {
        ^py ...$rest
    } else if (which ^python3 | is-not-empty) {
        ^python3 ...$rest
    } else {
        print "Error: Python is not installed or could not be found."
    }
}