'Set the turtle\'s second coordinate to y
Argument:
y -- a number (integer or float)
Set the turtle\'s first coordinate to x, second coordinate remains
unchanged.
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00, 40.00)
>>> turtle.sety(-10)
>>> turtle.position()
(0.00, -10.00)'

def sety(self, y):

    self._goto(Vec2D(self._position[0], y))
