Simulating a Steam Game for Reinforcement Learning

Hi! I want to train a reinforcement learning model to play a game on Steam. I want to create an environment on my PC where the model can pass input to the game without affecting the rest of my computer (i.e. without affecting my keyboard input to other programs) as well as take on visual information from the game without having the game explicitly be in the foreground. How could I achieve this, preferably in Python?