Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Object-Oriented Python Instant Objects Master Class

h

hjhg

racecar.py
class RaceCar:
    def __init__(self,color,fuel_remaining,laps=0,**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(length):
        fuel_remaining - length * 0.125
        laps += 1

3 Answers

Steven Parker
Steven Parker
216,057 Points

It would help if you were to explain your issue.

But I noticed a few things right off, when you subtract from the fuel_remaining the result isn't being stored. You probably want to use a subtraction assigment operator there ("-=").

Also, your run_lap method should have self as the first argument, which you would also use to prefix the names of the the instance variables ("self.fuel_remaining" and "self.laps").

Gabriel Santos
Gabriel Santos
4,113 Points

Please state the issue :O def run_lap(length): fuel_remaining -= length * 0.125 <--assign it to the variable laps += 1

sankalp yadav
sankalp yadav
2,101 Points

Try this, it will help . never write laps = laps +1 it is not good use or design.

```class RaceCar:

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

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