'Set the turtle\'s first coordinate to x
Argument:
x -- a number (integer or float)
Set the turtle\'s first coordinate to x, leave second coordinate
unchanged.
Example (for a Turtle instance named turtle):
>>> turtle.position()
(0.00, 240.00)
>>> turtle.setx(10)
>>> turtle.position()
(10.00, 240.00)'

def setx(self, x):

    self._goto(Vec2D(x, self._position[1]))
