scripts to track and switch to recent workspace

I recently switched from Xmonad to wingo, and I'm enjoying it.  Thanks!

One of the capabilities that I started missing was the ability to switch to the most recent/last visible workspace (a similar discussion appears in this thread: https://bbs.archlinux.org/viewtopic.php?pid=1357891#p1357891).

These python scripts implement this feature; I'm sharing them in case anyone else finds them useful.