def __init__(self, **kwargs):
    Circle.__init__(self, **kwargs)
    plus = TexMobject('+')
    plus.scale(0.7)
    plus.move_to(self)
    self.add(plus)
def __init__(self, **kwargs):
    Circle.__init__(self, **kwargs)
    plus = TexMobject('+')
    plus.scale(0.7)
    plus.move_to(self)
    self.add(plus)