Python

Question

How do I capture the class instance?

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):
    @property
    total = 0
    def rolls(self,amount):
        for _ in range(amount):
            self.append(D20


    def total(self):
        return sum(self)

Answer 1 · 2019-08-05T05:36:32Z

August 5, 2019 5:36am

You are very close! Here are the changes to make:

keep the total method unaltered. It looks like you have mixed the roll method code with the total method
remember to import D20 from dice
To be callable from the class Hand, the roll method should be decorated using @classmethod
be sure to call the method roll not "rolls"
as a class method, the first parameter will point to the current class. So "self" would point to the class. You could use inst = self() to create an instance. This is why class methods usually name the first parameter cls to imply "class", then an instance could be created using self = cls() which is more readable.
when appending D20, be sure to use instances of D20 created with the parens: D20()
lastly, be sure that the class method returns the instance you created: return self

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

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Ulfina Wakjira

Ulfina Wakjira

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Chris Freeman

Chris Freeman