倪仲帅
def draw_tree(length):
if length > 10:
tutu.forward(length)
tutu.right(20)
draw_tree(length - 20)
tutu.left(40)
draw_tree(length - 20)
tutu.right(20)
tutu.backward(length)
tutu.penup()
tutu.left(90)
tutu.backward(200)
tutu.pendown()
draw_tree(100)
turtle.done()
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