(self, angle)
Increment *in place* the virtual Polygon's rotation by ccw angle.

        See also: rotate method which moves the center.

        >>> from sympy import Polygon, Point, pi
        >>> r = Polygon(Point(0,0), 1, n=3)
        >>> r.vertices[0]
        Point(1, 0)
        >>> r.spin(pi/6)
        >>> r.vertices[0]
        Point(sqrt(3)/2, 1/2)

        See Also
        ========

        rotation
        rotate : Creates a copy of the RegularPolygon rotated about a Point
Increment *in place* the virtual Polygon's rotation by ccw angle.
Increment * in place * the virtual Polygon s rotation by ccw angle .
def spin(self, angle):
        """Increment *in place* the virtual Polygon's rotation by ccw angle.

        See also: rotate method which moves the center.

        >>> from sympy import Polygon, Point, pi
        >>> r = Polygon(Point(0,0), 1, n=3)
        >>> r.vertices[0]
        Point(1, 0)
        >>> r.spin(pi/6)
        >>> r.vertices[0]
        Point(sqrt(3)/2, 1/2)

        See Also
        ========

        rotation
        rotate : Creates a copy of the RegularPolygon rotated about a Point

        """
        self._rot += angle
def spin ( self , angle ) : self . _rot += angle