Mastering Python for Finance - Second Edition

Declaring an abstract method for sending orders

Add a send_market_order() abstract method for the inheriting child classes to implement when sending a market order to your broker:

@abstractmethod
def send_market_order(self, symbol, quantity, is_buy):
    raise NotImplementedError('Method is required!')

Using the preceding methods written in our Broker base class, we can now write broker-specific classes in the next section.