Calling a class

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)

#In the hands.py file import the D20 class from dice.py.
from dice import D20

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

#Create a classmethod named roll
    @classmethod 
    def roll(cls, num_dice):
        dice_list = []
        for x in range(num_dice):
            dice_list = dice_list.append(D20)
            return dice_list
        return cls(dice_list)