turtle.get_shapepoly()
Return the current shape polygon as tuple of coordinate pairs. This can be used to define a new shape or components of a compound shape.
>>> turtle.shape("square")
>>> turtle.shapetransform(4, -1, 0, 2)
>>> turtle.get_shapepoly()
((50, -20), (30, 20), (-50, 20), (-30, -20))