执行下面python程序后,以下哪个图形是正确的?( )
import turtle turtle.shape('square') turtle.home() turtle.dot() turtle.stamp() turtle.forward(100) turtle.setheading(90) turtle.stamp() turtle.forward(100) turtle.left(90) turtle.stamp() turtle.forward(100) turtle.left(90) turtle.stamp() turtle.forward(100)