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Python Object-Oriented Python (retired) Inheritance Instance Methods

challenge on instance metods

I know there are some errors in my program. But I cant figure it out. Please help me:

class Game:

  player = 1 
  def score(self,player):
    return  self.player

  def __init__(self):
    self.current_score = [0, 0]


2 Answers

Hi saro,

It's a little difficult to tell what your goal is with that code.

Are you trying to say that there is more than one player in your game Class?

If not, why does your init include a list with two numbers?

If so, why would you only increment one player's score and not update anything to the current_score?

So, the problem is, you're actually using 3 different types of variables called player.

First, you've got a local variable within the class Game, which will be an attribute of the class itself. It should instead be initialised with a default value when an instance of the class is created (put it in the __init__ function).

Second, you've got a parameter that is expected to be passed as an argument to the score function, which doesn't get used.

Third, you've got self.player, which would be an attribute of an instance of that class. It will use the value of the class attribute, since it didn't get one set for the instance itself.

I'd suggest changing your code to something like the following, depending on what your intention was.

If you only want one player's score being recorded:

class Game:

    def __init__(self):
        self.player = 1

    def score(self):
        self.player = self.player + 1
        return self.player

Used like this:

game = Game()
# game.player == 1

# game.player == 2

# game.player == 3

If you want to record the score of two competing players:

class Game:

    def __init__(self):
        self.current_score = [0, 0]

    def score(self, player):
        self.current_score[player] += 1

Used like this:

game = Game()
# game.current_score == [0, 0]

# increase first player's score (index 0)
# game.current_score == [1, 0]

# increase first player's score again
# game.current_score == [2, 0]

# increase second player's score (index 1)
# game.current_score == [2, 1]