def __init__(self, product_id=None):
    super(OrderBookConsole, self).__init__(product_id=product_id)
    self._bid = None
    self._ask = None
    self._bid_depth = None
    self._ask_depth = None
def __init__(self, product_id=None):
    super(OrderBookConsole, self).__init__(product_id=product_id)
    self._bid = None
    self._ask = None
    self._bid_depth = None
    self._ask_depth = None