This is an unorganized pile of code dealing with hooking the keyboard, sending keystrokes and stuff like that. It's a collection of a few experiments from over the years. Some of the code might work, most of it probably doesn't. I'm only posting this cuz somebody e-mailed me about this question and I thought I might as well dump my collection on GitHub.

I think I concluded the easiest approach was to invoke an external exe from a Python script with subprocess. I used the SendKeys program, which I think is Windows only.