setters

Question

i failing to understand how i can make it

product.py

class Product:
    _price = 0.0
    tax_rate = 0.12

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

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

Answer 1 · 2020-04-13T17:27:23Z

April 13, 2020 5:27pm

Hi Dennis,

Looks like you removed the @property price method. You want to keep that method and create a new setter method under the property method. The setter method will allow you to change the price of an instance later on. So, for example, if you did:

cheese = Product(2.50)
print(cheese.price)

This would tell you the price of cheese with the tax included. If you add a setter method (@price.setter), you would then be able to change the base price of cheese (_price is an attribute of the "Product" class). Like so:

cheese = Product(2.50)
print(cheese.price)
cheese.price = 3.00
print(cheese.price)

The terminal would now print out the updated total price. If you did not create a setter method, you wouldn't be able to change the _price attribute of the instance "cheese". This a little confusing in this example because what you are doing is updating the attribute "_price" even though there is also a method called "price" which returns the total cost of the cheese.

Hopefully that's not all too confusing. To sum up: You want to keep the property method "price" that was there before. You want to add a new setter method below the price method which takes an argument, "new_price", and then updates the "_price" attribute. It don't want to give away the answer but it will look like this:

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

    @price.setter
    def price(self, new_price):
        # set the attribute _price to the new price

Welcome to the Treehouse Community

Looking to learn something new?

Dennis Dumbreni

Dennis Dumbreni

setters

1 Answer

Jimmy Sweeney

Jimmy Sweeney

Dennis Dumbreni

Dennis Dumbreni