How to use the mercadopago.card.Card function in mercadopago

"""
        Instantiate MP with credentials:
        mp = mercadopago.MP(client_id, client_secret)

        Instantiate MP with Long Live Access Token:
        mp = mercadopago.MP(ll_access_token)
        """
        if len(args) == 2:
            self.__client_id = args[0]
            self.__client_secret = args[1]
        elif len(args) == 1:
            self.__ll_access_token = args[0]
        else:
            raise MPInvalidCredentials(None)

        self.card = Card(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.cardtoken = CardToken(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.customer = Customer(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.payment = Payment(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.preference = Preference(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.genericcall = GenericCall(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.discountcampaign = DiscountCampaign(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.identificationtype = IdentificationType(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)
        self.merchantorder = MerchantOrder(self.__client_id, self.__client_secret, self.__ll_access_token, self.version)

def __init__(self, client_id, client_secret, access_token, version):
        super(Card, self).__init__(client_id, client_secret, access_token, version)