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Python Object-Oriented Python Instant Objects Master Class

Posted by Soizic Demetz-Lovell
Soizic Demetz-Lovell
3,005 Points

Keep getting Bummer error

Hi again everyone! I figured out my last problem was just an indentation issue, fixed it, and my code passed the first task. Now I'm stuck trying to figure out why I keep getting an error on the second task as well! Here's the question: Vrroom! OK, now let's add a method named run_lap. It'll take a length argument. It should reduce the fuel_remaining attribute by length multiplied by 0.125. Oh, and add a laps attribute to the class, set to 0, and increment it each time the run_lap method is called.

I'm thinking it's something simple again that I'm just not seeing, but I can't go on until I figure it out. Thanks again and in advance!

racecar.py 
class RaceCar:
    def __init__(self, color, fuel_remaining, **kwargs):
        self.color = color
        self.fuel_remaining = fuel_remaining
        self.laps = 0

        for key, value in kwargs.items():
               setattr(self, key, value)  

    def run_lap(self, length):
        self.fuel_remaining -= length * 0.125
        self.laps = self.laps + 1
Soizic Demetz-Lovell
Soizic Demetz-Lovell
3,005 Points

Hm, still not working on my end.. No idea what's going on! Thanks a ton for your input Oszkar!

3 Answers

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

This code looks good, and when I paste it directly into the challenge, it passes. :+1:

Try again?

Soizic Demetz-Lovell
Soizic Demetz-Lovell
3,005 Points

Well after a ton of tries yesterday I ended up just leaving it hoping it would fix itself. Tried it first thing this morning and it finally went through. No idea what that was about, but glad it finally worked! Thank you for trying it out! :)

Justin Walters
seal-mask
.a{fill-rule:evenodd;}techdegree
Justin Walters
PHP Development Techdegree Student 18,894 Points
Justin Walters
.a{fill-rule:evenodd;}techdegree
Justin Walters
PHP Development Techdegree Student 18,894 Points

I have the same solution and the same issue and it has been driving me crazy. Why isn't my code acceptable?

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

There's always a slight chance your solution may be a bit different. Try creating a new fresh question and post your code there. Starting it from inside the challenge with the "get help" button should post your code with correct formatting (like on this question).

Chad Goldsworthy
Chad Goldsworthy
4,209 Points
Chad Goldsworthy
Chad Goldsworthy
4,209 Points

Just for anyone still struggling with this, I think I managed to find the issue. I tried all the code other people posted and said worked, but it did not work for me (and it seems there were many people having the same issue).

I ran it through my IDE and realised the length*0.125 in the run_lap method was causing a TypeError: unsupported operand type(s) for -=: 'str' and 'float'

So, when assigning fuel_remaining in the init method, you should convert it to a float as well, like: self.fuel_remaining = float(fuel_remaining)

I say "you should" lightly though, I'm no expert but it's just what fixed the issue for me.

This is the code that eventually worked for me:

class RaceCar:

    laps = 0

    def __init__(self, color, fuel_remaining, **kwargs):

        self.color = color
        self.fuel_remaining = float(fuel_remaining) # <-- this is what fixed it for me, 
                                                    #     adding the float() method
        for key, value in kwargs.items():
            setattr(self, key, value)

    def run_lap(self, length):
        self.fuel_remaining -= (length * 0.125)
        self.laps += 1
Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

It sounds like you may have been passing in a string when you created the test instance. I would expect the validation mechanism to pass in a number, and I can confirm that the code does pass without the explicit conversion.