CODEWITHSUNDEEP
dictionaryswitch-statementcasepython-3.10
TheAngriestCrusader
TheAngriestCrusader

Reputation: 373

Python match/case using dictionary keys and values

I'm making a pygame game, and whenever I run my code I get the error expected ':'. I am aware that using [ and ] in match/case blocks is used for something else, but how do I get around this issue?

case pygame.KEYDOWN:

    match event.key:

        case game.controls["pan_up"]:
            world_pos[1] -= 1

        case game.controls["pan_left"]:
            world_pos[0] -= 1

        case game.controls["pan_down"]:
            world_pos[1] += 1

        case game.controls["pan_right"]:
            world_pos[0] += 1

Error message box

Upvotes: 5

Views: 6671

Answers (1)

user16776498
user16776498

Reputation:

1. You can use .get

example based on your code:

case pygame.KEYDOWN:

    match event.key:

        case game.controls.get("pan_up"):
            world_pos[1] -= 1

        case game.controls.get("pan_left"):
            world_pos[0] -= 1

        case game.controls.get("pan_down"):
            world_pos[1] += 1

        case game.controls.get("pan_right"):
            world_pos[0] += 1

2. You can use dotted dict

it is just a subclassed dict that __getattr__ returns self.get.

there is a package for this here and if you are not the one that created that dict you can just cast it like this DottedDict({'bar': 2, 'foo': 1})

Upvotes: 5

Related Questions