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Here is the subclass of SpriteNode

class Powerup(SpriteNode):
def init(name, duration, from_brick):
self.name = name
self.duration = duration
self.from_brick = from_brick
SpriteNode.init(self.name, position=from_brick.position)

def __setattr__(name, duration, from_brick):
    SpriteNode.__setattr__(name, duration, from_brick)

It actually must display a Powerup on the screen.
Don't worry about the from_brick.position attribute in the init function, the from_brick attribute of my class must be a SpriteNode.

Notice: I have done all the indents, but they may be not displayed, don't worry.

Here is how I call the class to create a Powerup:

pup = Powerup("plf:Item_Star", 30, brickOnScreen)

The brickOnScreen variable was defined.

Gives a TypeError, that init() takes 3 arguments, but 4 were given (The error bookmark points at the line where I assign the class to the pup variable.

Thanks for your answers, programmers!

@happy_variable try the following instead of __init__:
def __init__ (self, name, dration, from_brick):
In python, class methods (except the staticmethods or classmethods) are called with the instance of the class as the first argument.

EDIT: You will also need to replace SpriteNode.__setattr__(name, duration, from_brick) with SpriteNode.__setattr__(self, name, duration, from_brick).
This is because SpriteNode.__setattr__ is a unbound class method.