Won't Pass Object - python-3.x

Question

I have been working on asteroids but my random moving asteroid function won't happen. Here is the code-
class Player():
def __init__(self, canvas):
self.shape = canvas.create_rectangle(910, 540, 960, 590, outline = "blue", fill= "white")
self.pos = canvas.coords(self.shape)
self.xspeed = 0
self.yspeed = 0
def move(self, canvas):
canvas.move(self.shape, self.xspeed, self.yspeed)
self.pos = canvas.coords(self.shape)
class Asteroid():
def __init__(self, canvas):
self.One = canvas.create_oval(0,0, 50, 50, fill="grey")
self.speedx = (10)
self.speedy = (10)
def move(self, canvas):
while True:
self.canvas.move(self.One, self.speedx, self.speedy)
self.canvas.after(20)
self.canvas.update()
def game():
#create window and canvas
parent = Tk()
canvas = Canvas(parent, width = 1920, height = 1080,
background="black")
parent.title("Asteroids")
canvas.pack()
#create player
player = Player(canvas)
enemyOne = Asteroid(canvas)
enemyOne.move(canvas)
And I get the error message-
AttributeError: 'Asteroid' object has no attribute 'canvas'
So the object canvas isn't being passed to Asteroids and def move. I included class Player for reference to show that passing canvas worked in the past. Thanks.

Answer 1

Your constructor call to Asteriod() passes in canvas as a parameter. But the constructor doesn't create an attribute called canvas, in other words there is no assignment
self.canvas = canvas
But the method move() calls self.canvas.move() which implies that self.canvas must exist. It doesn't, and that is why you get the message 'Asteroid' object has no attribute 'canvas'.