Question

I am trying to simply get the value out of my class using a simple function with a return value, I’m sure its a trivial error, but im pretty new to python

I have a simply class set up like this:

class score():
#initialize the score info 
    def __init__(self):
        self.score = 0
        self.num_enemies = 5
        self.num_lives = 3

    # Score Info
    def setScore(num):
        self.score = num

    # Enemy Info
    def getEnemies():
        return self.num_enemies

    # Lives Info
    def getLives():
        return self.getLives

etc.....

Than I create an instance of the class as such:

scoreObj = score()

for enemies in range(0, scoreObj.getEnemies):
    enemy_sprite.add(enemy())  

I get the error saying that an integer is expected, but it got an instancemethod

What is the correct way to get this information?

Thanks!

Answer 1

The first parameter for a member function in python is a reference back to the Object.

Traditionally you call it “self”, but no matter what you call the first parameter, it refers back to the “self” object:

Anytime I get weird errors about the type of a parameter in python, I check to see if I forgot the self param. Been bit by this bug a few times.

class score():
#initialize the score info 
    def __init__(self):
        self.score = 0
        self.num_enemies = 5
        self.num_lives = 3

    # Score Info
    def setScore(self, num):
        self.score = num

    # Enemy Info
    def getEnemies(self):
        return self.num_enemies

    # Lives Info
    def getLives(foo): #foo is still the same object as self!!
        return foo.num_lives
        #Works but don't do this because it is confusing