The _update_screen() Method
- simplify run_game() even further by moving the code for updating the screen to a separate method called _update_screen():


- moved the code that draws the background and the ship and flips the screen to _update_screen()
- now the body of the main loop in run_game() is much simpler
- easier to see new events, update the screen, tick the clock on each pass through the loop
- when building out a project, you won’t know how to structure your code at first
- this is a realistic development process: start writing code as simply as possible, and refactor it as your project grows more complex
- next, we’ll work on dynamic aspects of the game