def netto_total(self): return common.quantize(self.amount * self.price)
def netto_total(self): if self.fee is not None: return common.quantize((self.amount * self.price) - self.fee) return common.quantize(self.amount * self.price)
def netto_amount(self): if self.fee is not None: return common.quantize(self.amount - self.fee) return self.amount