This is a nearly complete implemention of standard TECO, in Python 3.
Unlike other TECO implementations, the characters are Unicode, not 8 bit characters. You can see this demonstrated in the sample macro bmp.tec.
If wxPython is installed (Python module "wx"), GT40 mode is available.
Currently ANSI compatible screen mode (:W command) is not implemented. It looks like this could be done using the Python "curses" module but I have not attempted to do so.
The code was written a while ago. Some of it is not a great example of Python style; in particular, I'm not sure I would use metaclasses in the way I did here.