Qtile is:
* simple, small and extensible. It's easy to write your own layouts,
widgets and built-in commands.
* configured entirely in Python.
* command-line shell that allows all aspects of Qtile to be manipulated and
inspected.
* complete remote scriptability - write scripts to set up workspaces,
manipulate windows, update status bar widgets and more.
* unit tested. Qtile's scriptability has made thorough unit testing
possible, making it one of the best-tested window managers around.