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

jessechapman
jessechapman
4,088 Points
Posted by jessechapman
jessechapman
4,088 Points

run_lap method in Object-Oriented Coding challenge

The def init method words fine, but I have hit a wall with the run_lap method portion this challenge. The challenge specifies that length should be passed as an argument to the method, that it should reduce fuel_remaining by .125 times the length, and that it should increase the laps by one. I have tried including all of these as parameters for the run_laps method, as well as returning the values using a tuple. Unfortunately, after many variations, I can't see to identify the problem. In every case, the error message is only "Bummer: Try again!"

racecar.py 
class RaceCar:
    def __init__(self, color, fuel_remaining, laps, **kwargs):
        self.color = color
        self.fuel_remaining = fuel_remaining
        self.laps = 0
        for k, v in kwargs.items():
            setattr(self, k, v)

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

1 Answer

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

It looks like you added a "laps" argument to __init__ after passing task 1, but it should not be changed in task 2.

Also, the "run_lap" method is only intended to take a length argument. It won't take "fuel_remaining" or "laps" as arguments. Those are internal variables that you already have correctly referenced using the "self." prefix.