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

Stacey Normington
Stacey Normington
5,861 Points
Posted by Stacey Normington
Stacey Normington
5,861 Points

master class q2

I don't know where I'm going wrong with this it's not giving me any errors other than try again

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

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

Hey Stacey Normington, you’re really close!

Inside the run_lap method, “fuel_remaining” and “laps” are not defined.

:point_right: be sure to use the prefix self. to reference attributes. method: self.fuel_remaining and self.laps

Post back if you need more help. Good luck!!!

Stacey Normington
Stacey Normington
5,861 Points
Stacey Normington
Stacey Normington
5,861 Points

I defined laps and fuel remaining inside run_lap, where else should I add self its still coming up with try again

Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

In run_lap method, all variable names except length should have self. prefix. I see two places this needs to be fixed.

Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points 
def run_lap(self, length):
        self.fuel_remaining = fuel_remaining - (length * 0.125)
        #       not defined  ^^^^^^^^^^^^^^
        self.laps = laps + 1
        #          ^^^^ not defined