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 Dice Roller RPG Roller

Posted by Alex Moats
Alex Moats
4,535 Points

Getting length of Hand: Trouble with RPG Roller 2 of 2

I'm still having trouble getting the challenge to pass. I'm getting an error of 'cannot get length of Hand'. Everything works correctly in workspaces. I'll past some outputs below.

dice.py 
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)
hands.py 
from dice import D20

class Hand(list):
    def __init(self, size=0, die_class=None, *args, **kwargs):
        super().__init__()

        for _ in range(size):
            self.append(die_class())

    def __len__(self):
        return super().__len__()

    @property
    def total(self):
        return sum(self)

    @classmethod
    def roll(cls, size_in):
        return cls(size=size_in, die_class=D20)

This is a sample output pulled from workspaces with the exact code above

>>> from hands import Hand                                                            
>>> Hand.roll(2).total                                                                 
22                                                                                     
>>> Hand.roll(2)                                                                       
[<dice2.D20 object at 0x7fccc709e080>, <dice2.D20 object at 0x7fccc709e0f0>]           
>>> len(Hand.roll(2))                                                                  
2 
>>> h = Hand.roll(2)                                                                   
>>> len(h)                                                                             
2

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

SO close! You're missing the trailing "dunder" in Hand.__init