Quite simply I would like to have a board, if one exists, that i can plug my TV stream (the cord that comes from my cable box) into the Pi and have an HDMI come out of the pi to the TV. Using python the Pi itself could switch between the TV and the Pi.
Ern, sorry if I'm being too harsh. Just exactly when did HDMI-CEC commands went vintage? https://en.wikipedia.org/wiki/Consumer_Electronics_Control
You can send a "switch input to HDMI" signal to most modern TVs. In fact, some Raspberry Pi mediacenter distros like XBian does it out of the box. Worth a try, looks exactly like what you need.
This could be the thing you are searching for in this video: https://vimeo.com/153959180
And this is a link to the product page: http://www.auvidea.eu/index.php/theme-styles/2014-12-30-22-32-06/b101