分叉树

import turtle
def tree(branchLen,t):
if branchLen > 5:
(branchLen)
(20)
tree(branchLen-15,t)
(40)
tree(branchLen-15,t)
(20)
(branchLen)
def main():
t = ()
myWin = ()
(90)
()
(100)
()
(“green”)
tree(75,t)
()