Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
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.
Start your free trialdoesitmatter
12,885 Points[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.
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):
@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
1 Answer
Steven Parker
231,236 PointsThis 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.
doesitmatter
12,885 Pointsdoesitmatter
12,885 PointsHow would that look like? I thought something like:
But this keeps raising a ValueError, unless I change it to this:
def __init__(self, size=0, die_class=D20, *args, **kwargs):
Strange no?
Steven Parker
231,236 PointsSteven Parker
231,236 PointsThat 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.