Code works locally, but doesn't pass the test. Feedback isn't verbose, so not clear what's up.

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)

class Hand(list):
    @property
    def total(self):
        total = 0
        for item in self:
            total += int(item)
        return total

    def roll(dice=1):
        result_hand = Hand()
        for _ in range(dice):
            result_hand.append(D20())
        return result_hand