'Rotate the turtleshape by angle.
Argument:
angle - a number
Rotate the turtleshape by angle from its current tilt-angle,
but do NOT change the turtle\'s heading (direction of movement).
Examples (for a Turtle instance named turtle):
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(30)
>>> turtle.fd(50)
>>> turtle.tilt(30)
>>> turtle.fd(50)'

def tilt(self, angle):

    self.settiltangle((angle + self.tiltangle()))
