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Exercise 6

Going back to your solution to exercise 1, refactor the code to replace any methods that can be converted to static methods. Once you have done that, ask yourself whether the conversion to a static method makes sense.

Solution

class Car:
    # Code omitted for brevity.

    # highlight
    @staticmethod
    def engine_start():
        print('The engine is on!')
    # endhighlight

    # Code omitted for brevity.

lumina = Car('chevy lumina', 1997, 'white')
Car.engine_start() # The engine is on!

# Code omitted for brevity.

Changing lumina.engine_start() to Car.engine_start() wasn't entirely necessary; the code would work either way.

Changing engine_start to a static method in this class is probably not a great idea. While the method doesn't need self or cls, a real engine_start method would almost certainly need access to the attributes of the Car instance; turning an engine on takes more than just saying it is on.

Note that you might also try converting gas_mileage from question 4 to a static method. However, we've asked you to update the solution to question 1.

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