Django中的if语句无法正常工作

Question

I have a small project and I have been unable to get the following statement to work. Any help would be great. User inputs can either self.sale_head which is a $ value,if a $ value is not add a self.estimated_weight_hd is used to get the total weight, the code below should return a estimated_weight_total which can be used for the total sale price. All works when I add the estimated_weight_total manually. I am lost as why.

def calc_estimated_weight_total(self):
    if self.sale_head <= 0:
        amount = (self.number * self.estimated_weight_hd)
        return amount

def save(self):
    self.estimated_total_weight = self.calc_estimated_weight_total()
    super(SaleNote, self).save()

Answer 1

Your code doesn't do what you want cause if self.sale_head > 0 nothing will return. From your description, I think your code should be somthing like:

def calc_estimated_weight_total(self):
    if self.sale_head <= 0:
        amount = (self.number * self.estimated_weight_hd)
        return amount
    else:
        return something_only_you_know

def save(self):
    self.estimated_total_weight = self.calc_estimated_weight_total()
    super(SaleNote, self).save()