python pattern match object

system ^{2023-12-02T02:37:24Z}: You are an python expert}

user ^{2024-06-19T07:37:16Z}: rewrite the code using match in python 3.10. “"”from decorator import dispatch_on

class Rock(object): ordinal = 0

class Paper(object): ordinal = 1

class Scissors(object): ordinal = 2

@dispatch_on(‘a’, ‘b’) def win(a, b): if a.ordinal == b.ordinal: return 0 elif a.ordinal > b.ordinal: return -win(b, a) raise NotImplementedError((type(a), type(b)))

@win.register(Rock, Paper) def winRockPaper(a, b): return -1

@win.register(Paper, Scissors) def winPaperScissors(a, b): return -1

@win.register(Rock, Scissors) def winRockScissors(a, b): return 1

print(win(Paper(), Rock())) “””

assistant ^{2024-06-19T07:37:22Z}: To rewrite the given code using the match statement available in Python 3.10, you can leverage the new pattern matching syntax. Here is the code adapted to use match:

class Rock:
    ordinal = 0


class Paper:
    ordinal = 1


class Scissors:
    ordinal = 2


def win(a, b):
    if a.ordinal == b.ordinal:
        return 0
    elif a.ordinal > b.ordinal:
        return -win(b, a)
    
    match (a, b):
        case (Rock(), Paper()):
            return -1
        case (Paper(), Scissors()):
            return -1
        case (Rock(), Scissors()):
            return 1
        case (_, _):
            raise NotImplementedError((type(a), type(b)))

print(win(Paper(), Rock()))

This updated code achieves the same logic but uses the match statement to handle the different game situations based on the types of a and b. The match cases are checked sequentially, and the appropriate case is executed when a match is found.