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Any suggestions?

dice.py
```import random

class Die:
def __init__(self, sides=2, value = 0):
if sides < 2:
raise ValueError("Can't have fewer than two sides")
self.sides = sides
self.value = value or random.randint(1, sides)

def __int__(self):
return self.value

return int(self) + other

return self + other

def __repr__(self):
return str(self.value)

def __len__(self):
return len(self)

class D20(Die):
def __init__(self, sides = 2):
super().__init__(sides = 20)
```
hands.py
```from dice import D20

class Hand(list):
def __init__(self, size = 2, die_class = D20, *args, **kwargs):
self.die_class = die_class
self.size = size
super().__init__()

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

def roll(self, input):
if not isinstance(input, int):
raise ValueError("Input must be a whole number")
for _ in range(input):
self.append(self.die_class())
return self
``` 