fuel_remaining isnt changing (wrong scope??)

Question

Hey!
I'm stuck on this assignment, I don't really understand how to get certain variables I guess. It seems I can't change fuel_remaining, it always stays the same and I'm wondering what I'm doing wrong.
```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):
    RaceCar.laps += 1
    self.fuel_remaining = (length * 0.125)
```

Jennifer Nordell · Answer

Hi there, @Marco Koopman (https://teamtreehouse.com/marcokoopman)! You're doing terrific and you clearly understand how to set the value of a variable. But you forgot something tiny here (you're literally off by one character). Every time we run a lap we want to reduce the amount of fuel remaining by a certain amount. Makes sense, right? We run a lap and now we have less fuel. Each time you run a lap, you're setting the fuel_remaining to the same number so it never changes.
You wrote:
```py
self.fuel_remaining = (length * 0.125)
```
But you meant to write:
```py
self.fuelremaining = self.fuelremaining - (length * 0.125)
```
Or in shorthand:
```py
self.fuel_remaining -= (length * 0.125)
```
These will reduce the amount of fuel remaining and set the fuel_remaining value to the now reduced value.
Hope this helps! :sparkles:

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Marco Koopman

Marco Koopman

fuel_remaining isnt changing (wrong scope??)

1 Answer

Jennifer Nordell

Jennifer Nordell