'The axis of symmetry of the parabola.
Returns
axis_of_symmetry : Line
See Also
sympy.geometry.line.Line
Examples
>>> from sympy import Parabola, Point, Line
>>> p1 = Parabola(Point(0, 0), Line(Point(5, 8), Point(7, 8)))
>>> p1.axis_of_symmetry
Line2D(Point2D(0, 0), Point2D(0, 1))'

@property
def axis_of_symmetry(self):

    return self.directrix.perpendicular_line(self.focus)
