``` import turtle def tree(n,l): turtle.pen(fillcolor="black", pencolor="red", pensize=10) turtle.forward(225) print(sorted(turtle.pen().items())) print('------------') print(turtle.pen().items()) tree(12,100) tree(5,'5') ``` ``` from turtle import * from random import * from math import * def tree(n,l): pd()#下筆 #陰影效果 t = cos(radians(heading()+45))/8+0.25 pencolor(t,t,t) pensize(n/3) forward(l)#畫樹枝 if n>0: b = random()*15+10 #右分支偏轉角度 c = random()*15+10 #左分支偏轉角度 d = l*(random()*0.25+0.7) #下一個分支的長度 #右轉一定角度,畫右分支 right(b) tree(n-1,d) #左轉一定角度，畫左分支 left(b+c) tree(n-1,d) #轉回來 right(c) tree(5,50) ```