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Python

andrea kalifa
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.a{fill-rule:evenodd;}techdegree
andrea kalifa
Python Web Development Techdegree Student 2,935 Points
Posted by andrea kalifa
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andrea kalifa
Python Web Development Techdegree Student 2,935 Points

Define setter property

I'm test and re-test my code and always I'm getting right price value.

Challenge give me the follow problem: "Bummer: Didn't correctly set the @price property"

And really, I don't know why..

product.py 
class Product:
    _price = 0.0
    tax_rate = 0.12

    def __init__(self, base_price):
        self._price = base_price

    @property
    def price(self):
        return self._price + (self._price * self.tax_rate)

    @price.setter
    def price(self, price):
        self._price = price / (self.tax_rate + 1)

2 Answers

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

You got too fancy! The challenge wants a setter "that updates the _price attribute". What they mean is that it should directly update the attribute, without making any tax calculations on it.

andrea kalifa
seal-mask
.a{fill-rule:evenodd;}techdegree
andrea kalifa
Python Web Development Techdegree Student 2,935 Points
andrea kalifa
.a{fill-rule:evenodd;}techdegree
andrea kalifa
Python Web Development Techdegree Student 2,935 Points

Ok nice, but I'm confuse.

If I get price by "self._price + (self._price * self.tax_rate)"

when I set directly price by @price.setter, to get updated _price, shouldn't I make inverse calculation?

For example:

price = 5 tax = 1 total price = price + tax = 6

If I update total price to 10 , my updated price should be 9 right?

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

I can understand the confusion, but they don't want an inverse calculation (though you did a great job on that!). They just want a way to update the base price itself.

Happy coding!