Well, someone posted a fix (add "ser.close()" before "ser.open()") and I got it working! Huzzah! I have cleared the daily data!
Except I seemingly inadvertently cleared the OTHER settings at some point, so it still doesn't, you know, actually work >_< ("Armband not set up")
Anyone have a clue as to how to write stuff (I think the fields are weight, height, handedness, smoking and some other random things) to the device? My Python is teh suxx0rz.