最近翻到一篇知乎，上面有不少用Python（大多是turtle库）绘制的树图，感觉很漂亮，我整理了一下，挑了一些我觉得不错的代码分享给大家（这些我都测试过，确实可以生成喔~）
one 樱花树
动态生成樱花
效果图（这个是动态的）：
import turtle as Timport randomimport time# 画樱花的躯干(60,t)def Tree(branch, t):time.sleep(0.0005)if branch > 3:if 8 <= branch <= 12:if random.randint(0, 2) == 0:t.color('snow') # 白else:t.color('lightcoral') # 淡珊瑚色t.pensize(branch / 3)elif branch < 8:if random.randint(0, 1) == 0:t.color('snow')else:t.color('lightcoral') # 淡珊瑚色t.pensize(branch / 2)else:t.color('sienna') # 赭(zhě)色t.pensize(branch / 10) # 6t.forward(branch)a = 1.5 * random.random()t.right(20 * a)b = 1.5 * random.random()Tree(branch - 10 * b, t)t.left(40 * a)Tree(branch - 10 * b, t)t.right(20 * a)t.up()t.backward(branch)t.down()# 掉落的花瓣def Petal(m, t):for i in range(m):a = 200 - 400 * random.random()b = 10 - 20 * random.random()t.up()t.forward(b)t.left(90)t.forward(a)t.down()t.color('lightcoral') # 淡珊瑚色t.circle(1)t.up()t.backward(a)t.right(90)t.backward(b)# 绘图区域t = T.Turtle()# 画布大小w = T.Screen()t.hideturtle() # 隐藏画笔t.getscreen().tracer(5, 0)w.screensize(bg='wheat') # wheat小麦t.left(90)t.up()t.backward(150)t.down()t.color('sienna')# 画樱花的躯干Tree(60, t)# 掉落的花瓣Petal(200, t)w.exitonclick()
飘落效果
效果图：
from turtle import *from random import *from math import *def tree(n,l):pd()#下笔#阴影效果t = cos(radians(heading()+45))/8+0.25pencolor(t,t,t)pensize(n/3)forward(l)#画树枝if n>0:b = random()*15+10 #右分支偏转角度c = random()*15+10 #左分支偏转角度d = l*(random()*0.25+0.7) #下一个分支的长度#右转一定角度,画右分支right(b)tree(n-1,d)#左转一定角度，画左分支left(b+c)tree(n-1,d)#转回来right(c)else:#画叶子right(90)n=cos(radians(heading()-45))/4+0.5pencolor(n,n*0.8,n*0.8)circle(3)left(90)#添加0.3倍的飘落叶子if(random()>0.7):pu()#飘落t = heading()an = -40 +random()*40setheading(an)dis = int(800*random()*0.5 + 400*random()*0.3 + 200*random()*0.2)forward(dis)setheading(t)#画叶子pd()right(90)n = cos(radians(heading()-45))/4+0.5pencolor(n*0.5+0.5,0.4+n*0.4,0.4+n*0.4)circle(2)left(90)pu()#返回t=heading()setheading(an)backward(dis)setheading(t)pu()backward(l)#退回bgcolor(0.5,0.5,0.5)#背景色ht()#隐藏turtlespeed(0)#速度 1-10渐进，0 最快tracer(0,0)pu()#抬笔backward(100)left(90)#左转90度pu()#抬笔backward(300)#后退300tree(12,100)#递归7层done()
暗色效果
效果：
from turtle import *from random import *from math import *def tree(n, l):pd()t = cos(radians(heading() + 45)) / 8 + 0.25pencolor(t, t, t)pensize(n / 4)forward(l)if n > 0:b = random() * 15 + 10c = random() * 15 + 10d = l * (random() * 0.35 + 0.6)right(b)tree(n - 1, d)left(b + c)tree(n - 1, d)right(c)else:right(90)n = cos(radians(heading() - 45)) / 4 + 0.5pencolor(n, n, n)circle(2)left(90)pu()backward(l)bgcolor(0.5, 0.5, 0.5)ht()speed(0)tracer(0, 0)left(90)pu()backward(300)tree(13, 100)done()
two 玫瑰花
效果（有绘制过程）
from turtle import *import timesetup(1000,800,0,0)speed(0)penup()seth(90)fd(340)seth(0)pendown()speed(5)begin_fill()fillcolor('red')circle(50,30)for i in range(10):fd(1)left(10)circle(40,40)for i in range(6):fd(1)left(3)circle(80,40)for i in range(20):fd(0.5)left(5)circle(80,45)for i in range(10):fd(2)left(1)circle(80,25)for i in range(20):fd(1)left(4)circle(50,50)time.sleep(0.1)circle(120,55)speed(0)seth(-90)fd(70)right(150)fd(20)left(140)circle(140,90)left(30)circle(160,100)left(130)fd(25)penup()right(150)circle(40,80)pendown()left(115)fd(60)penup()left(180)fd(60)pendown()end_fill()right(120)circle(-50,50)circle(-20,90)speed(1)fd(75)speed(0)circle(90,110)penup()left(162)fd(185)left(170)pendown()circle(200,10)circle(100,40)circle(-52,115)left(20)circle(100,20)circle(300,20)speed(1)fd(250)penup()speed(0)left(180)fd(250)circle(-300,7)right(80)circle(200,5)pendown()left(60)begin_fill()fillcolor('green')circle(-80,100)right(90)fd(10)left(20)circle(-63,127)end_fill()penup()left(50)fd(20)left(180)pendown()circle(200,25)penup()right(150)fd(180)right(40)pendown()begin_fill()fillcolor('green')circle(-100,80)right(150)fd(10)left(60)circle(-80,98)end_fill()penup()left(60)fd(13)left(180)pendown()speed(1)circle(-200,23)exitonclick()
from turtle import *import randomimport timen = 100.0speed("fastest")screensize(bg='seashell')left(90)forward(3*n)color("orange", "yellow")begin_fill()left(126)for i in range(5):forward(n/5)right(144)forward(n/5)left(72)end_fill()right(126)color("dark green")backward(n*4.8)def tree(d, s):if d <= 0: returnforward(s)tree(d-1, s*.8)right(120)tree(d-3, s*.5)right(120)tree(d-3, s*.5)right(120)backward(s)tree(15, n)backward(n/2)for i in range(200):a = 200 - 400 * random.random()b = 10 - 20 * random.random()up()forward(b)left(90)forward(a)down()if random.randint(0, 1) == 0:color('tomato')else:color('wheat')circle(2)up()backward(a)right(90)backward(b)time.sleep(60)
