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Python

Posted by taejooncho
taejooncho
Courses Plus Student 3,923 Points

Stuck in Capitalism, the Game part 3

Hello, I think I am trying to do what the task is asking me to do, but I can't seem to find out where in my code I am doing wrong to fix the issue.

I have rewatched the lecture video that talks about classmethods, and I still feel lost. Would anyone please guild me and explain what I am doing wrong.

Thank you in advance.

hands.py 
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")
        super().__init__()

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

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

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

    @property
    def doubles(self):
        return self[0] == self[1]

    @classmethod
    def reroll(cls):
        if self[0] == self[1]:
            return cls().__init__()
        else:
            return cls(self)

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

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

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

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

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

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

    @property
    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)
        }

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,426 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points

You are very close. The method reroll does not need to recheck if doubles are present.

:point_right: remove if statement

:point_right: the second return statement is all that's needed, but without the self argument

Edited: The correct return statement should be return cls()

taejooncho
taejooncho
Courses Plus Student 3,923 Points

Hello Mr.Freeman, As always thank you for all your help, it has really helped me tremendously!

I saw your suggestion, but may I ask why I need to remove if statement?

My interpretation of the task was that if I have doubles I would return a new instance. If I remove the if statement how can I make the code so that Python will reroll if there is double..

Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points

Because regardless of the if results,

return cls()

should be the next statement

Edited: to match updated challenge checker.

taejooncho
taejooncho
Courses Plus Student 3,923 Points

Ah, okay that makes sense. When I implemented your suggestion it solved the challenge.

Can I also ask if this code (return cls(self)) has no errors? Originally, I thought that it was this line that was giving me errors..

Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points

In cls(self), the self is not defined in a classmethod.

nicole lumpkin
PLUS
nicole lumpkin
Courses Plus Student 5,328 Points
nicole lumpkin
nicole lumpkin
Courses Plus Student 5,328 Points

Yikes, I've gone over this entire section twice including the Constructicons vid on classmethods and I still do not understand why the answer is simply 

return cls().__init__()

I'm not even familiar with this syntax. I've only seen a return with cls look something like this:

return cls(something_in_here)

Any additional information would be great, I'm so lost on this one

Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points

Thank you nicole lumpkin!! You post a most excellent question. I've dug deeper and chatted with Kenneth Love about this challenge. The for cls().__init__() does not make sense it effectively runs __init__() twice, once on instance creation and again on the explicit call to __init__(). However, since __init__() does not return anything, None would be returned from the @classmethod.

So the correct answer in this case should have been

    return cls()

Until today, this challenge checker accepted both answers as correct. Now only the above answer will work. I've updated my answers on this thread to reflect this change.

Post back if you have more questions. And Thanks Again!!!

nicole lumpkin
nicole lumpkin
Courses Plus Student 5,328 Points
nicole lumpkin
nicole lumpkin
Courses Plus Student 5,328 Points

Thank you so much Chris Freeman!! You're help is so appreciated! It can be difficult learning this on your own, plugging away day after day. Thanks for making me and I'm sure many others feel valued and looked after in the Community.