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 Gakenaope Elizabeth Mabutho
Gakenaope Elizabeth Mabutho
1,950 Points

What is wrong with my code??

I keep getting an error that says"couldn't import D20"

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 roll(num_dice):
        hand = Hand()
        for i in range(num_dice):
            die = D20()
            hand.append(die)
        return hand

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

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

You are very close! The issues are:

  • the D20 class definition is indented too far
  • decorate roll method with @classmethod
  • add missing cls parameter as *first parameter in roll method
  • use cls() to create hand instance instead of Hand()

Post back if you need more help. Good luck!!!

Gakenaope Elizabeth Mabutho
Gakenaope Elizabeth Mabutho
1,950 Points

I am hoping that i have followed all your suggestions but i still get an error with the second task. Here is my answer;

from dice import D20

class Hand(list):

    class Hand(list):
    def roll(cls, num_dice):
         cls() = hand
        for i in range(num_dice):
            die = D20()
            hand.append(die)
        return cls(hand)

    @property
    def total(self):
        return sum(self)
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

Getting closer! Here are the current issues:

  • there is an extra class Hand statement
  • missing decorator @classmethod
  • cls() = hand should be hand = cls()
  • return hand not cls(hand)