Python Object-Oriented Python Dice Roller RPG Roller

Witali Weber
Witali Weber
7,675 Points

Get the Error Bummer: Can't get the length of a `Hand` Can anybody help me?

Cannot solve the following Error: Bummer: Can't get the length of a Hand

Any ideas

Code:

import dice

class Hand(list): @property def total(self): return sum(self)

def roll(self, size):
    for i in range(size):
        self.append(dice.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__(20)
hands.py
import dice

class Hand(list):
    @property
    def total(self):
        return sum(self)

    def roll(self, size):
        for i in range(size):
            self.append(dice.D20())

3 Answers

Steven Parker
Steven Parker
202,109 Points

You're on the right track, but this method doesn't currently return anything. The instructions say it should return "an instance of Hand".

And since the challenge intends "to use code similar to Hand.roll(2)" (notice "Hand" is the class itself), you probably want to make this a class method.

Witali Weber
Witali Weber
7,675 Points

Thanks for the fast response. But I don't get it. :-(

Steven Parker
Steven Parker
202,109 Points

Which part? To return a value, a method needs an explicit "return" statement. And the Constructicons video covers making class methods.

Witali Weber
Witali Weber
7,675 Points

Thanks for the recap video. I hit it.

Steven Parker
Steven Parker
202,109 Points

Witali Weber — Glad to help. You can mark the question solved by choosing a "best answer".
And happy coding!