Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.


Capitalism The Game Step 2

Really stuck. I feel like I need to add the second die. Not sure though.

from dice import D6

class Hand(list):
    def __init__(self, size=0, die_class=None, *args, **kwargs):
        if not die_class:
            raise ValueError("You must provide a die class")

        for _ in range(size):

    def _by_value(self, value):
        dice = []
        for die in self:
            if die == value:
        return dice

class CapitalismHand(Hand):
    def __init__(self):
        super().__init__(size=2, die_class=D6)

    def doubles(self):
        hand = []
        if hand[0] == hand[1]:
            return True
        if hand[0] != hand[1]:
            return False

    def ones(self):
        return self._by_value(1)

    def twos(self):
        return self._by_value(2)

    def threes(self):
        return self._by_value(3)

    def fours(self):
        return self._by_value(4)

    def fives(self):
        return self._by_value(5)

    def sixes(self):
        return self._by_value(6)

    def _sets(self):
        return {
            1: len(self.ones),
            2: len(self.twos),
            3: len(self.threes),
            4: len(self.fours),
            5: len(self.fives),
            6: len(self.sixes)

Nevermind, figure it out.

    def doubles(self):
        if self[0] == self[1]:
            return True
        if self[0] != self[1]:
            return False

I have a follow-up question to this, why do we use if self[0] == self[1] ? why didn't we use hand[0]...? What does self mean in this example ? why didn't the first code you wrote above work ?

Chris Freeman
Chris Freeman
Treehouse Moderator 67,987 Points

Eldin Guzin, self refers to the current class instance. The original code does work because hand is defined as an empty list that has none of the properties or methods found in a Hand instance.

The method code is running “inside” the class. It does not have a way to reference its instance name. That is, it does not know the name of its variable label (“hand”, in this case). “self” is a label that is used to point to the same thing as the unknowable variable label points to.

Post back if you need more help. Good luck!!!

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 67,987 Points

Get job figuring it out. As an additional tip, you can replace:

if cond:
    return True
else not cond:
    return False

with the preferred style:

return cond

Aww, that's much more simple/beautiful. Appreciate the additional input. :D

Spencer Hurrle
Spencer Hurrle
3,128 Points

Why would self.dice not work the same? The dice list is created/updated as an attribute in the class through the _by_value method, isn't it?

Chris Freeman
Chris Freeman
Treehouse Moderator 67,987 Points

Spencer Hurrle, in the method _by_value, the list label dice is a variable local to the method and is not accessible outside the method. That is, the attribute self.dice is undefined.