Noob Python help!

How would you make Python press a button? What would you have to type to get the program to "activate" a keyboard button.
like

if input()=='y':
output()= press key (g)

or something like that although obviously the ouput() parts don't exist in Python. Also on that ntoe does anyone know any Python simple syntax dictionaries, IDLE's built in one kinda sucks.

Program an Arduino robot with servos to press that button for you!
If you add two more servos, two rails, and a map of keyboard, you can make it press any button you want, any at all, not just ``g''!!