import turtledef draw_smalltreetree_length tree_angle tree_wide if tree_length 5 return turtleforwardtree_length # 绘制树干 turtlerighttree_angle # 右转30度 draw_smalltreetree_len

import turtle

def draw_smalltree(tree_length, tree_angle, tree_wide): if tree_length < 5: return

turtle.pensize(tree_wide) # 设置画笔粗细
turtle.forward(tree_length) # 绘制树干
turtle.right(tree_angle) # 右转30度

draw_smalltree(tree_length - 10, tree_angle, tree_wide - 1) # 递归绘制下一段树枝

turtle.left(60) # 左转60度
draw_smalltree(tree_length - 10, tree_angle, tree_wide - 1) # 递归绘制下一段树枝

turtle.right(30) # 右转30度
turtle.backward(tree_length) # 回到上一节点

turtle.speed(0) # 设置画笔速度为最快 turtle.left(90) # 左转90度，使得树干朝上 turtle.penup() # 抬起画笔，不绘制直线 turtle.goto(0, -200) # 移动画笔到屏幕中心下方 turtle.pendown() # 落下画笔，开始绘制树形结构

turtle.pencolor("green") # 设置画笔颜色为绿色

draw_smalltree(80, 30, 10)

turtle.done() # 完成绘制，保持窗口不关