using a variable from a class in python

Question

I think this question has been asked before but I have not found an answer suited to my problem. I basically have a class for different characters, which each have a cost. When creating a character, I want to take their cost away from the players score.

Here is an example of a class:

class Assassin(pygame.sprite.Sprite):
    def __init__(self, x, y, row, column):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load("assassin.png")
        self.x = x
        self.type = "assassin"
        self.y = y
        self.rect = self.image.get_rect(center=(self.x, self.y))
        self.damage = 60
        self.health = 40
        self.speed = 2
        self.move = False
        self.cost = 4
        self.row = row
        self.column = column

And here is the code where I would want to use the variable:

 if assassin.collidepoint(pygame.mouse.get_pos()) and mouseDown[0]:
            for block in blockGroup:
                if block.team1Taken == False and block.column ==1:
                    team1.add(Assassin(block.team1[0], block.team1[1], block.row, block.column))
                    block.team1Taken = True
                    score -= Assassin.__init__.cost #Example of what I think you would do
                    break

I hope I have explained this well enough to understand what I want.

Which Assassin's cost attribute would you like to access? The Newly created one or the one you use for the if condition? If the new one then follow my answer. If the one from the if condition, simply use assassin.cost — DeepSpace
– DeepSpace, Commented Nov 19, 2017 at 12:11
you will be a happier Python user if you always indent 4 spaces, and not vary the indentation depending on the wording of the line that starts the block. — jsbueno
– jsbueno, Commented Nov 20, 2017 at 21:48

chgsilva · Accepted Answer · 2017-11-19 12:13:04Z

2

You can't call score -= Assassin.__init__.cost in python. The init method is the constructor of the Class and should be used to do so.

The value that you want is inside the object that you created, so you could call assassin.cost directly, assuming that assassin is the object.

So, you just need to change to:

if assassin.collidepoint(pygame.mouse.get_pos()) and mouseDown[0]:
            for block in blockGroup:
                if block.team1Taken == False and block.column ==1:
                    current_assassin = Assassin(block.team1[0], block.team1[1], block.row, block.column)
                    team1.add(current_assassin)
                    block.team1Taken = True
                    score -= current_assassin.cost
                    break

edited Nov 19, 2017 at 12:13

answered Nov 19, 2017 at 12:05

chgsilva

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chgsilva Over a year ago

You should make Assassin(block.team1[0], block.team1[1], block.row, block.column) an object and then use it to get the cost and add it to the team1.

DeepSpace · Accepted Answer · 2017-11-19 12:09:58Z

2

You will need to keep a reference to the Assassin instance you create and then access its cost attribute:

if assassin.collidepoint(pygame.mouse.get_pos()) and mouseDown[0]:
    for block in blockGroup:
        if block.team1Taken == False and block.column == 1:
                new_assassin = Assassin(block.team1[0], block.team1[1],
                                        block.row, block.column)
                team1.add(new_assassin)
                block.team1Taken = True
                score -= new_assassin.cost
                break

edited Nov 19, 2017 at 12:09

answered Nov 19, 2017 at 12:04

DeepSpace

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