How does this work?

Start with tcod, which is a sort of uber library for making roguelikes. Seems a bit like cheating.

Import some classes Engine, Entity, EventHandler and a generate_dungeon function.

main runs and returns None sets the screen width and height sets the map width (same) and height (5 pixels less for some reason)

sets the max room size to 10
min room size to 6
max rooms on a map are 30
max monsters in a room are 2

use tcod to load an image file that has a set of tiles on it, one with 32 columns and 8 rows, and map it to a character map used by roguelikes

the function returns a Tileset object and used later for rendering the screen.

create an EventHandler
create a player Entity, place it at the x/2 and y/2 location (center of the map), tell it to be a @ character and it's color is 255, 255, 255 or white

create a GameMap with generate_dungeon using the max/min values from above and the player entity

create an Engine with an event handler and game map, and a player

create a terminal context (I'm not sure what this means exactly... looks like it manages the window and rendering...) with the height, width, tilesest, etc.

create a console in the context
create an infinite loop that...
    calls the engine.render() method
    listens for events
    if there's an event, passes it to the engine's event handler