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!
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
Andrei Oprescu9,547 Points
Can't understand how to do this challange
So I am doing a challenge and I am given this question:
Now update Hand in hands.py. I'm going to use code similar to Hand.roll(2) and I want to get back an instance of Hand with two D20s rolled in it. I should then be able to call .total on the instance to get the total of the two dice.
I'll leave the implementation of all of that up to you. I don't care how you do it, I only care that it works.
And my code is at the bottom of the comment.
Can someone please tell me what i did wrong and How I can complete this challenge?
import random class Die: def __init__(self, sides=2): if sides < 2: raise ValueError("Can't have fewer than two sides") self.sides = sides self.value = random.randint(1, sides) def __int__(self): return self.value def __add__(self, other): return int(self) + other def __radd__(self, other): return self + other class D20(Die): def __init__(self): super().__init__(sides=20)
from dice import D20 class Hand(list): @property def total(self): return sum(self) def roll(self, rolls): from _ in range(rolls): self.append(int(D20.value))
Chris FreemanTreehouse Moderator 68,390 Points
You are on the right path. Three items need correcting:
- To be called as
Hand.roll(2), the method
rollneeds to be decorated as a
- As a classmethod, there is no instance yet, so create one using
inst = self()since self points to the class when decorated as a classmethod
- The instance created needs to be returned! So include a
return instin the method
Not syntactically wrong, but a style norm is to use
cls instead of
self in the classmethod code.
Post back if you have more questions. Good luck!