I ran my code in Pycham it works, but it doesn't work here, please help to find the reason, really appreciate!

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)

from dice import D20

class Hand(list):


    def __init__(self, lst):
        super().__init__(lst)

    @classmethod
    def roll(cls, times = 0):
        lst = []
        for _ in range(times):
            lst.append(dice.D20().value)
        return cls(lst)

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