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Python Object-Oriented Python Dice Roller RPG Roller

Deniz Kahriman
Deniz Kahriman
8,538 Points

What am I doing wrong here? Can you please help? Thanks!!!

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.

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=D20):
        self.size = size
        super().__init__()
        for _ in range(size):
            self.append(die_class())

    @classmethod
    def roll(cls, size=2)
        return cls.size

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

4 Answers

Steven Parker
Steven Parker
231,072 Points

You're pretty close, but I see a few issues:

  • you forgot the colon (":") at the end of the definition line for the roll method
  • cls represents the class itself (not an instance), so you can't take the size property of it
  • you want to return an instance of the class, so you'll need to invoke it (with parentheses after the name)
  • remember to pass the size argument when you create the instance
Deniz Kahriman
Deniz Kahriman
8,538 Points

Thanks, Steven!! Sorry, had to repost the changes I made because there was a typo. I'm stuck again as I don't know what needs to be added to make the code work. Can you please take a look? Thank you again!

from dice import D20:

class Hand(list):

    def __init__(self, size=0, die_class=D20):
        self.size = size
        super().__init__()
        for _ in range(size):
            self.append(die_class())

    @classmethod
    def roll(cls, size=2):
        return cls(size)

    @property
    def total(self):
        return sum(self)
Steven Parker
Steven Parker
231,072 Points

Somehow, you stuck a stray colon on the end of your import line. Otherwise, I think you've got it. :+1:

Deniz Kahriman
Deniz Kahriman
8,538 Points

Ahhhh... thanks, Steven!! :)

Deniz Kahriman could you comment the code pls? im still really stuck on this

from dice import D20

class Hand(list):

def __init__(self, size=0, die_class=D20):
    self.size = size
    super().__init__()
    for _ in range(size):
        self.append(die_class())

@classmethod
def roll(cls, size=2):
    return cls(size)

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

from dice import D20

class Hand(list):

def __init__(self, size=0, die_class=D20):
    self.size = size
    super().__init__()
    for _ in range(size):
        self.append(die_class())

@classmethod
def roll(cls, size=2):
    return cls(size)

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

Thanks to Deniz Kahriman and Steven Parker on this one, this one actually works..Thanks guys!