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

UnboundLocalError

I'm not sure what is wrong with the code, when I run it it gives me a UnboundLocalError. Can I use fuel_remaining in my second method the way that I have?

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

1 Answer

Steven Parker
Steven Parker
231,236 Points

Since it's a local field, "fuel_remaining" needs a "self." prefix. "Laps" will need one also.

But creating a "self.length" is not part of the instructions.

Thank you for the help!