:-: **绘制如下图形**  ``` from turtle import * for i in range(10): penup() length = 10 * (i + 1) pendown() left(90) fd(length) left(90) fd(length) left(90) fd(length * 2) left(90) fd(length * 2) left(90) fd(length * 3) left(90) fd(length * 3) done() ```