Shortcut for ``instrument.order("SELL", ...)`` and accepts all of its
        `optional parameters <#qtpylib.instrument.Instrument.order>`_

        :Parameters:
            quantity : int
                Order quantity

def sell(self, quantity, **kwargs):
        """ Shortcut for ``instrument.order("SELL", ...)`` and accepts all of its
        `optional parameters <#qtpylib.instrument.Instrument.order>`_

        :Parameters:
            quantity : int
                Order quantity
        """
        self.parent.order("SELL", self, quantity=quantity, **kwargs)