Project: Text adventure

Project: Text adventure

• You build the start of a text adventure: rooms, exits, and a player who walks around.
• The map is a dictionary of dictionaries: each room has a text and its exits.
• You use dictionaries, in, functions and a loop.

What you will build

You are in a dark hall.
> north
A kitchen. It smells of bread.
> south
You are in a dark hall.
> east
Books everywhere. A cat is sleeping.

Step 1: a dictionary inside a dictionary

• rooms["hall"] is the hall's own dictionary.
• So rooms["hall"]["text"] is its text, and rooms["hall"]["exits"] is its exits.

rooms = {"hall": {"text": "A dark hall.", "exits": {"north": "kitchen"}}}
print(rooms["hall"]["text"])
print(rooms["hall"]["exits"]["north"])

Step 2: is there a door?

• key in dictionary is True when the dictionary has that key.
• Check it before you read the key, or Python stops with a KeyError.

Step 3: follow a list of directions

• Keep the current room in a variable.
• For each direction, replace it with the room move returns.
• Return the variable after the loop.

Play for real

• Type north, south, east or west, and quit to stop.

rooms = {
    "hall": {"text": "You are in a dark hall.", "exits": {"north": "kitchen", "east": "library"}},
    "kitchen": {"text": "A kitchen. It smells of bread.", "exits": {"south": "hall"}},
    "library": {"text": "Books everywhere. A cat is sleeping.", "exits": {"west": "hall"}},
}
room = "hall"
print(rooms[room]["text"])
command = input("> ")
while command != "quit":
    exits = rooms[room]["exits"]
    if command in exits:
        room = exits[command]
        print(rooms[room]["text"])
    else:
        print("You cannot go that way.")
    command = input("> ")

Now build it

• Three steps, each a function. Then add your own rooms to the map and play.