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

Jordon Crichton
Jordon Crichton
1,868 Points
Posted by Jordon Crichton
Jordon Crichton
1,868 Points

I am unsure what I am missing here.

OK, now let's add a method named run_lap. It'll take a length argument. It should reduce the fuel_remaining attribute by length multiplied by 0.125.

Oh, and add a laps attribute to the class, set to 0, and increment it each time the run_lap method is called.

racecar.py 
class RaceCar:
    laps = 0
    def __init__(self,color,fuel_remaining,**kwargs):
        self.color = color
        self.fuel_remaining= fuel_remaining

        for key,value in kwargs.items():
            setattr(self,key,value)

    def run_lap(self,length):
        laps += 1 
        self.fuel_remaining -= (self.length* 0.125)

1 Answer

Steven Parker
Steven Parker
231,248 Points
Steven Parker
Steven Parker
231,248 Points

You're pretty close, but in the "run_lap" method where you increment "laps", it should be "self.laps".

On the other hand, the next line references "self.length" but that's not part of the class. Since it's a parameter of the method it should just be "length".