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Exercise 2

Using decorators, add getter and setter methods to your Car class so you can view and change the color of your car. You should also add getter methods that let you view but not modify the car's model and year. Don't forget to write some tests.

Solution

class Car:

    def __init__(self, model, year, color):
        #highlight
        self._model = model
        self._year = year
        self.color = color    # Uses color setter
        #endhighlight
        self.speed = 0

    # Omitted code

    #highlight
    @property
    def color(self):
        return self._color

    @color.setter
    def color(self, color):
        self._color = color

    @property
    def model(self):
        return self._model

    @property
    def year(self):
        return self._year
    #endhighlight

# Omitted code

#highlight
print(f'My car is {lumina.color}.')
# My car is white.

print(f"My car's model is a {lumina.model}.")
# My car's model is a chevy lumina.

print(f"My car's year is {lumina.year}.")
# My car's year is 1997.

lumina.color = 'brown'
print(f'My car is now {lumina.color}.')
# My car is now brown.

lumina.year = 2023
# AttributeError: property 'year' of 'Car' object
# has no setter
#endhighlight

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