__new__ = TypeError：object（）不带参数

Question

I wanted my class to be able to create objects by itself, and I saw this was possible with the ' new ', but apparently it's not working since I get this error :

TypeError : object() takes no parameters

So there is the class I'm working with, I do post all of it in case it may come from another part of the code.

class Planete:

    def __new__(cls, rayon, periode, envergure,look):


        print("test __new__ of the class {}".format(cls))

        return object.__new__(cls, rayon, periode, envergure,look)

    def __init__(self,rayon,periode,envergure,look):

        self.rayon = rayon
        self.periode = periode
        #self.couleur = couleur
        self.envergure = envergure
        self.omega = (2*math.pi)/self.periode
        self.i = 0

        self.look = pygame.transform.rotozoom(look,0,self.envergure)

        self.rect = pygame.Rect((0, 0), (0, 0))

        #self.surf = pygame.Surface(self.rect.size)

    def tourner(self) :

        self.x = self.rayon*math.cos(self.omega*self.i)
        self.x2 = int(self.x)+600
        self.y = self.rayon*math.sin(self.omega*self.i)
        self.y2 = int(self.y)+300
        self.i = self.i + 1

        self.rect = pygame.Rect((self.x2, self.y2), (50, 50))

    def dessiner(self):
        #pygame.draw.circle(gameDisplay,(self.couleur),((self.x2, self.y2)), self.envergure)
        #gameDisplay.blit(self.surf,self)
        gameDisplay.blit(self.look,(self.x2, self.y2))

Answer 1

The problem is exactly what the error message says: TypeError: object() takes no parameters

In your __new__ method, you call object.__new__(cls, rayon, periode, envergure,look) which is (with respect with the cls parameter) what would be called for object(rayon, periode, envergure, look) .

The direct fix is to replace that line with :

    return object.__new__(cls)

But anyway, as you have been said in comment, you have no real reason to use __new__ here: extract from the Python Language Reference:

new () is intended mainly to allow subclasses of immutable types (like int, str, or tuple) to customize instance creation.

As your Planete class is not an immutable type, and as you use __init__ for its customization, you should not use __new__ at all.