问在我的字典中用笛卡尔坐标测试密钥

EN

class Position:
    def __init__(self, x,y):
        self.x = int(x)
        self.y = int(y)
    def __eq__(self, other):

        return self.x == other.x and self.y == other.y

    def __repr__(self):
        return '({}, {})'.format(self.x, self.y)

    def __hash__(self):
        return hash(str(self))


class Piece:


    def __init__(self, color, type_piece):
        self.color = color
        self.type_piece = type_piece

    def is_pawn(self):

        return self.type_piece == "pawn"

    def is_queen(self):
        return self.type_piece == "queen"

    def is_white(self):
        return self.color == "white"

    def is_balck(self):
        return self.color == "black"

    def change(self):
        self.type_piece = "queen"

    def __repr__(self):
        if self.is_white() and self.is_pawn():
            return "o"
        elif self.is_white() and self.is_queen():
            return "O"
        elif self.is_black() and self.is_pawn():
            return "x"
        else:
            return "X"

class board:

    def __init__(self):
        self.n_x = 8
        self.n_y = 8

        self.cases = { Position(1,1):Piece("white","pawn") }  #example of what my dict contains

    def check_piece(self, position):

        if Position(position) in self.cases.keys():
            return cases.get(Position(position))
        else:
            return False