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

        :Parameters:
            quantity : int
                Order quantity
            price : float
                Limit price

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

        :Parameters:
            quantity : int
                Order quantity
            price : float
                Limit price
        """
        kwargs['limit_price'] = price
        kwargs['order_type'] = "LIMIT"
        self.parent.order("BUY", self, quantity=quantity, **kwargs)