应用题
4. 使用turtle库绘制简单城市剪影图形，效果如下图所示。阅读程序框架，补充横线处代码。
【正确答案】import turtle
turtle.setup(800,300)
turtle.penup()
turtle.fd(-350)
turtle.pendown()
def DrawLine(size):
for angle in[0,90,-90,-90,90]:
turtle.left(angle)
turtle.fd(size)
for i in[20,30,40,50,40,30,20]:
DrawLine(i)
turtle.hideturtle()
turtle.done()
turtle.setup(800,300)
turtle.penup()
turtle.fd(-350)
turtle.pendown()
def DrawLine(size):
for angle in[0,90,-90,-90,90]:
turtle.left(angle)
turtle.fd(size)
for i in[20,30,40,50,40,30,20]:
DrawLine(i)
turtle.hideturtle()
turtle.done()
【答案解析】