New beginner, defining point help :(

[Armandas]

I'M USING PYTHON 3.2.1
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So I have bought a book few days ago and got to it today. Its called "More Python Programming for the absolute beginner by Jonathan S. Harbour. I have copied the code to see how it works. On the way I experience few annoying errors I can't find a way to solve. Help would be nice 

class Point():
    x = 0.0
    y = 0.0

    def _init_(self,x,y):
        self.x = x
        self.y = y
        print("Point constructor")

        def ToString(self):
            return "{X:" + str(self.x) + ",Y:" + str(self.y) + "}"

    class Circle(Point):
        radius = 0.0

        def _init_(self,x,y,radius):
            super()._init_(x,y)
            self.radius = radius
            print("Circle constructor")

            def ToString(self):
                    return super().ToString() + \
                           ",{RADIUS=" + str(self.radius) + "}"

            p = Point(10,20)
            print(p.ToString())

            c = Circle(100,100,50)
            print(c.ToString())

ERROR:

line 1, in <module>

    class Point():

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line 13, in Point

    class Circle(Point):