'Called just before drawing a shape to be filled.
No argument.
Example (for a Turtle instance named turtle):
>>> turtle.begin_fill()
>>> turtle.forward(100)
>>> turtle.left(90)
>>> turtle.forward(100)
>>> turtle.left(90)
>>> turtle.forward(100)
>>> turtle.left(90)
>>> turtle.forward(100)
>>> turtle.end_fill()'

def begin_fill(self):

    self.fill(True)
