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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today. # [SOLVED] Can't get the length of 'Hand'

Stuck on this challenge task 2/2, what exactly do they want here? What am I doing wrong?

EDIT: Solved the problem, I did not read the question correctly, the question states that it will call `Hand.roll()`. This means that the `roll` method shouldn't have a `self` as an argument.

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

return int(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
def total(self):
return sum(self)

def roll(self, num):
some_hand = Hand()

for _ in range(0, num):
some_dice = D20()
some_hand.append(some_dice)

return some_hand
``` This is a situation where `@classmethod` might be useful. Instead of a "self" argument you would get a "cls" argument that you could use for instantiating the hand.

But however you did it, congratulations on resolving your issue. How would that look like? I thought something like:

```class Hand(list):

def __init__(self, size=0, die_class=None, *args, **kwargs):
super().__init__()

if not die_class:
raise ValueError("No die_class.")

for _ in range(0, size):
self.append(die_class())

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

@classmethod
def roll(cls, num):
return cls(size=num, die_class=D20)
```

But this keeps raising a ValueError, unless I change it to this:

`def __init__(self, size=0, die_class=D20, *args, **kwargs):`

Strange no? That makes sense because without a default value for die_class it would be a required argument and before the override of `__init__` was added, it was not required. So when the challenge tests creating a plain instance of Hand, it would fail.