class Encoche:

    def __init__(self, tablier, *args, etat=VIDE):
        self.tablier = tablier
        if len(args) == 2:
            self.x, self.y = args
            self.num = self.to_num(self.x, self.y)
        else:
            self.num = args[0]
            self.x, self.y = self.to_coords(self.num) 
        self.etat = etat
    
    def to_num(self, x, y):
        return self.tablier.coords_to_num(x, y)
    
    def to_coords(self, num):
        return self.tablier.num_to_coords(num)
    
    def switch(self):
        self.etat = 1 - self.etat