我相信我有一个 Function 争论问题

Question

For the most part all of my code seems to be working fine. The code is a text-based game. When I collect all of the items it fuctions correctly without errors. But if I go to directly to Caslte Black without collecting all the items it finishes with the proper message, but I get the following error:

Traceback (most recent call last):
  File "C:\Users....................", line 38, in <module>
    city_item = cities[current_city][0]
KeyError: 'Castle Black'

Here is my code.

print("Welcome to the GOT: Winter is Coming Text Based Game")

player_name = input("What is your name Lord Commander? ")

print("\nIntroduction:")
print("      Sir " + player_name + ", as Lord Commander of the Kingsguard")
print("      you are to visit 10 cities across Westeros and Essos, and you MUST")
print("      collect the item from each city to win the game and defeat the Night King.")
print("   Once you collect all the items you automatically win the game defeating the Night King.")
print("      If you confront the Night King without all 10 items, you will perish and")
print("      all of Westeros and Essos will be doomed!")
print("\nGame Play Directions:")
print("   To move in a direction you will be prompted to chose either North, South, East or West")
print("   To collect an item, you will be prompted to enter 'Y' for 'YES' or 'N' for 'NO'.")
print("\nYou are now ready to begin your quest Lord Commander " + player_name + "!\n\n\n")

cities = {"King's Landing": [None, ["North", "South", "East", "West"]],
         "Casterly Rock": ["The Oathkeeper Sword", ["South", "East"]],
         "Highgarden": ["A Golden Rose", ["North"]],
         "Sunspear": ["A Viper", ["North", "East"]],
         "Great Pyramid Meereen": ["Drogon the Dragon", ["West"]],
         "Dragonstone": ["Dragon Glass", ["North", "West"]],
         "Pyke": ["The Iron Fleet", ["East"]],
         "The Twins": ["A Letter of Passage", ["North", "South", "East", "West"]],
         "The Eyrie": ["A Falcon", ["South", "West"]],
         "The Dreadfort": ["Lord Bolton's Army", ["West"]],
         "Winterfell": ["Ghost the Dyer Wolf", ["South", "East", "West"]]
         }

inventory = []
current_city = "King's Landing"

while True:
    if current_city == "Castle Black":
        print("You have been defeated by the Night King! The Realm is doomed!")

    print("Lord Commander, you are currently in", current_city, ".")
    city_item = cities[current_city][0]
    print("The current room has", city_item)

    if city_item != None:
        option = input("Do you want collect " + city_item + "? (Y/N): ") .upper()
        if option in ['Y', 'YES']:
            inventory.append(city_item)
            cities[current_city][0] = None

    print("Collected items: ", inventory)

    if len(inventory) == 10:
        print("\nCONGRATULATIONS!")
        print("You have collected all the items and have defeated the Night King!\n")
        break

    direction = input("Which direction do you want to go? (North, South, East, West): ")

    while direction not in cities[current_city][1]:
        print("You cannot go that way from " + current_city + ". Please try another direction.")
        direction = input("Which direction do you want to go? (North, South, East, West): ")

    if current_city == "King's Landing":
        if direction == "North":
            next_city = "The Twins"
        elif direction == "South":
            next_city = "Sunspear"
        elif direction == "East":
            next_city = "Dragonstone"
        else:
            next_city = "Casterly Rock"

    elif current_city == "The Twins":
        if direction == "North":
            next_city = "Winterfell"
        elif direction == "South":
            next_city = "King's Landing"
        elif direction == "East":
            next_city = "The Eyrie"
        else:
            next_city = "Pyke"

    elif current_city == "Sunspear":
        if direction == "North":
            next_city = "King's Landing"
        else:
            next_city = "Great Pyramid Meereen"

    elif current_city == "Great Pyramid Meereen":
        next_city = "Sunspear"

    elif current_city == "Casterly Rock":
        if direction == "South":
            next_city = "Highgarden"
        else:
            next_city = "King's Landing"

    elif current_city == "Highgarden":
        next_city = "Casterly Rock"

    elif current_city == "Dragonstone":
        if direction == "North":
            next_city = "The Eyrie"
        else:
            next_city = "King's Landing"

    elif current_city == "The Eyrie":
        if direction == "South":
            next_city = "Dragonstone"
        else:
            next_city = "The Twins"

    elif current_city == "Pyke":
        next_city = "The Twins"

    elif current_city == "Winterfell":
        if direction == "South":
            next_city = "The Twins"
        elif direction == "East":
            next_city = "The Dreadfort"
        else:
            next_city = "Castle Black"

    elif current_city == "The Dreadfort":
        next_city = "Winterfell"

    current_city = next_city
    print("My Lord, you have moved to", current_city, ".\n")

print("\nThank you for saving the Realm!")

When I change the argument from 0 to 1 and start the game over

city_item = cities[current_city][1]

I get the following error:

Traceback (most recent call last):
  File "C:\Users\............................", line 42, in <module>
    option = input("Do you want collect " + city_item + "? (Y/N): ") .upper()
TypeError: can only concatenate str (not "list") to str

I am unsure which way I should go from here.

Answer 1

After the first condition in the loop, add a break or wrap the rest in an else . You're trying to access cities["Castle Black"] , hence the KeyError .