Method __init__

code/OO/Ball.py:36–39

(self, x,y,r)

class Ball:
  def __init__(self, x,y,r):
    self.x = x
    self.y = y
    self.r = r
  def collides_with(self, other):
    dx = self.x - other.x
    dy = self.y - other.y