有没有办法阻止用户“走出”我的“地图”？

Question

'd4': {
        ZONENAME : 'Kingdom Church',
        DESCRIPTION : 'description',
        EXAMINATION : 'examine',
        SOLVED : False,
        UP : 'c4',
        DOWN : '',
        LEFT : 'd3',
        RIGHT : ''
}

This dictionary (part of a nested dictionary) representing the 'map'. D4 is the last tile down and the last tile right. It seems I can't figure it out how to deal with the app crash when someone tries to go right or down when at location d4. I need something like this:

if myPlayer.location == 'd4' and zonemap['d4'][RIGHT = '']
   print("You can't go there!")

Some more code that may be helpful and may let u understand my project better:

def print_location():
    print('\n'+'#' + myPlayer.location.upper() + '#')
    print('#' + zonemap[myPlayer.location][DESCRIPTION] + '#' + '\n')
    
def prompt():
    print('================================')
    print('\n' + 'What would you like to do?')
    action = input('> ').lower()
    acceptable_actions = ['move', 'go', 'travel', 'walk', 'quit', 'examine', 'inspect', 'interact','look']
    while action not in acceptable_actions:
        print('Unknown action, please try again.\n')
        action = input('> ').lower()
    if action == 'quit':
        sys.exit()
    elif action in ['move', 'go', 'travel', 'walk']:
        player_move(action)
    elif action in ['examine', 'inspect', 'interact', 'look']:
        player_examine(action)

def player_move(myAction):
    ask = 'Where would you like to move to?\n> '
    dest = input(ask)
    if dest in ['up', 'north']:
        destination = zonemap[myPlayer.location][UP]
        movement_handler(destination)
    elif dest in ['left', 'west']:
        destination = zonemap[myPlayer.location][LEFT]
        movement_handler(destination)   
    elif dest in ['down', 'south']:
        destination = zonemap[myPlayer.location][DOWN]
        movement_handler(destination)
    elif dest in ['right', 'east']:
        destination = zonemap[myPlayer.location][RIGHT]
        movement_handler(destination)

def movement_handler(destination):
    myPlayer.location = destination
    print_location()

You have here the function that prints the location as A1 A2 etcetera and the description. The function that prompts over and over as the main loop. Last but not least the player movement function and the movement handler.

Answer 1

Probably you already figured out what to do, but here is what I've would done.

def player_move(myAction):
    ask = 'Where would you like to move to?\n> '
    dest = input(ask)
    direction = None
    if dest in ['up', 'north']:
        direction = UP
    elif dest in ['left', 'west']:
        direction = LEFT
    elif dest in ['down', 'south']:
        direction = DOWN
    elif dest in ['right', 'east']:
        direction = RIGHT
    if not direction:
        # you need to check if the correct direction was entered
        print ("ERROR wrong direction ... ")
        return
    if not zonemap[myPlayer.location][direction]:
        # You use empty string if player cannot go in direction so negation of empty string is True
        print ("You cannot go there")
        return
    mPlayer.location = zonemap[myPlayer.location][direction]

This way you cover all cases - UP/LEFT/DOWN/RIGHT with single check.