def unsubscribe_price(self, prod_code):
    try:
        self._price_queues.pop(prod_code)
    finally:
        subscribe_price(prod_code, 0)
def unsubscribe_price(self, prod_code):
    try:
        self._price_queues.pop(prod_code)
    finally:
        subscribe_price(prod_code, 0)