def random_point(self, seed=None):
        """A random point on the ellipse.

        Returns
        =======

        point : Point

        See Also
        ========

        sympy.geometry.point.Point
        arbitrary_point : Returns parameterized point on ellipse

        Notes
        -----

        A random point may not appear to be on the ellipse, ie, `p in e` may
        return False. This is because the coordinates of the point will be
        floating point values, and when these values are substituted into the
        equation for the ellipse the result may not be zero because of floating
        point rounding error.

        Examples
        ========

        >>> from sympy import Point, Ellipse, Segment
        >>> e1 = Ellipse(Point(0, 0), 3, 2)
        >>> e1.random_point() # gives some random point
        Point2D(...)
        >>> p1 = e1.random_point(seed=0); p1.n(2)
        Point2D(2.1, 1.4)

        The random_point method assures that the point will test as being
        in the ellipse:

        >>> p1 in e1
        True

        Notes
        =====

        An arbitrary_point with a random value of t substituted into it may
        not test as being on the ellipse because the expression tested that
        a point is on the ellipse doesn't simplify to zero and doesn't evaluate
        exactly to zero:

        >>> from sympy.abc import t
        >>> e1.arbitrary_point(t)
        Point2D(3*cos(t), 2*sin(t))
        >>> p2 = _.subs(t, 0.1)
        >>> p2 in e1
        False

        Note that arbitrary_point routine does not take this approach. A value
        for cos(t) and sin(t) (not t) is substituted into the arbitrary point.
        There is a small chance that this will give a point that will not
        test as being in the ellipse, so the process is repeated (up to 10
        times) until a valid point is obtained.

        """
        from sympy import sin, cos, Rational
        t = _symbol('t')
        x, y = self.arbitrary_point(t).args
        # get a random value in [-1, 1) corresponding to cos(t)
        # and confirm that it will test as being in the ellipse
        if seed is not None:
            rng = random.Random(seed)
        else:
            rng = random
        for i in range(10):  # should be enough?
            # simplify this now or else the Float will turn s into a Float
            c = 2*Rational(rng.random()) - 1
            s = sqrt(1 - c**2)
            p1 = Point(x.subs(cos(t), c), y.subs(sin(t), s))
            if self in p1:
                return p1
        raise GeometryError(
            'Having problems generating a point in the ellipse.')
dataset/ETHPy150Open sympy/sympy/sympy/geometry/ellipse.py/Ellipse.random_point/swapped operands of `in`