如何利用python画樱花树

= 1.6*random.random()         b = 1.6 * random.random()         t.left(20*a)#再画左支         draw_tree(branch -10*b,t)#画左支         t.right(40*a)         draw_tree(branch-10*b,t)#右枝         t.left(20*a)         t.up