class Room

Rooms have the attributes and methods we identified in our first pass plus the methods we have shifted from Cave_Systems to Rooms:

• Attributes: 3 tunnels, possibly a bat, possibly a pit, possibly a wumpus.
• Methods: Should be able to tell us if it has a bat, has a pit, or has a wumpus,
  plus
  "should be able to tell us where you can go from here/what rooms are connected to this one; if a room has a bat; if a room has a pit; if the player is in a room.

Note the duplication in the methods list has a bat and has a pit appears twice! That means that in our first pass we had assigned two classes responsibility for answering that question. It's almost always better to have one class responsible for each action, so this revision already looks like an improvement.

But not perfect. In our pseudocode we ask the player for its location repeatedly (look for the references to player.location). Note that we don't ask a room if a player is in it, we ask the player. So we'll remove that method from class Room, leaving us with,

• Attributes: 3 tunnels, possibly a bat, possibly a pit, possibly a wumpus.
• Methods: Should be able to tell us where you can go from here (what rooms are connected to this one) and if it has a bat, has a pit, or has a wumpus.

In Python we get,

Notes:

• We will identify rooms by their number as shown in MAP previously.
• connections here is a list of rooms connected by tunnels to this one, e.g. [1, 7, 4] meaning this room is connected to room number 1, room number 7, and room number 4.
• By default a room does not have a bat, pit or wumpus (b=None, p=None, w=None). These will be sprinkled around the cave system later.
• The has_... methods that answer questions look to see if the relevant attribute is defined and if it is returns True, otherwise False.

In memory a single Room object can be pictured like this (for room 12 which connects to rooms 11, 13 and 16, and has a Bat but no Pit or Wumpus),

and an entire cave system can be pictured as (with most rooms left out and only the details for room 12 shown),

The remaining classes are relatively straightforward compared to these first two.