Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Object-Oriented Python Instant Objects Master Class

Posted by Sean Coutinho
Sean Coutinho
7,788 Points

Race Car class

I'm not sure were I'm going wrong here. Is the length argument for the run_lap method also an attribute of RacceCar? What code should I use to nail this question?

racecar.py 
class RaceCar():

    def __init__(self, color, fuel_remaining, laps, **kwargs):
        self.color = color
        self.fuel_remaining = fuel_remaining
        self.laps = 0
        for key, value in kwargs.items():
            setattr(self, key, value)

    def run_lap(self, length):
        self.fuel_remaining = self.fuel_remaining - (length*0.125)
        self.laps+=1
Daniel Adari
Daniel Adari
3,577 Points
Daniel Adari
Daniel Adari
3,577 Points

Here is my solution:

class RaceCar:  # Here, you don't need parenthesis.

    def __init__(self, color, fuel_remaining, **kwargs):  # There is no need to take laps as a parameter.
        self.color = color
        self.fuel_remaining = fuel_remaining
        self.laps = 0

        for attr, val in kwargs.items():
            setattr(self, attr, val)

    def run_lap(self, length):
        self.fuel_remaining -= length*0.125  # You can simplify this line.
        self.laps += 1

1 Answer

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

You're extremely close. The only serious issue is that "laps" should not be an argument to __init__, it wasn't being used anyway.

And as Daniel pointed out, you don't need parentheses in the class definition (but oddly, the challenge doesn't seem to notice them).