def update(self):
    (self.x, self.y) = coordinates(self.x, self.y, self.radius, self.angle)
    self.angle += random((- self.step), self.step)
    self.time *= (0.8 + random(0.2))
def update(self):
    (self.x, self.y) = coordinates(self.x, self.y, self.radius, self.angle)
    self.angle += random((- self.step), self.step)
    self.time *= (0.8 + random(0.2))