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 Alex John
Alex John
206 Points

help help

dont get the question

racecar.py 
class RaceCar():
    laps = 0
    def __init__(self, color, fuel_remaining,laps, **kwargs):
        self.color = color
        self.fuel_remaining = fuel_remaining
        self.laps=laps
        for key, value in kwargs.items():
            setattr(self, key, value)
    def run_lap(self, length):
        length - fuel_remaining * 0.125
        laps += 1

1 Answer

Steven Parker
Steven Parker
230,995 Points
Steven Parker
Steven Parker
230,995 Points

It looks like you're on task 2. The instructions say "add a laps attribute to the class", but they don't say it should be an argument to the __init__ method. The validation mechanism is not expecting to need an extra argument to create an instance.

Then, for the "run_lap" method they say it "should reduce the fuel_remaining attribute by length multiplied by 0.125". But the code "length - fuel_remaining * 0.125" has these issues:

  • the class variable is missing the "self." prefix
  • the fuel is being multiplied by the constant instead of the length
  • the length is being reduced instead of the fuel
  • the final calculation result isn't being stored anywhere

And the first hint (about "self.") applies to the "laps" calculation as well.