动态的圣诞树

搭建Python基本运新环境，创建 .py文件把下面代码放进去。

import turtle as t
from turtle import *
import random as r
import time

n = 100.0

speed("fastest")
screensize(bg='black')
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)

def drawlight():
    if r.randint(0,30)==0:
        color('tomato')
        circle(6)
    elif r.randint(0,30)==1:
        color('orange')
        circle(3)
    else:
        color('dark green')

color("dark green")
backward(n*4.8)
def tree(d,s):
    if d<=0:return
    forward(s)
    tree(d-1,s*.8)
    right(120)
    tree(d-3,s*.5)
    drawlight()
    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*r.random()
    b = 10-20*r.random()
    up()
    forward(b)
    left(90)
    forward(a)
    down()
    if r.randint(0,1)==0:
        color('tomato')
    else:
        color('wheat')
    circle(2)
    up()
    backward(a)
    right(90)
    backward(b)

t.color("dark red","red")
t,write("Merry Christmas",align="center",font=("Comic SansMS",40,"bold"))

def drawsnow():
    t.ht()
    t.pensize(2)
    for i in range(200):
        t.pencolor("white")
        t.pu()
        t.setx(r.randint(-350,350))
        t.sety(r.randint(-100,350))
        t.pd()
        dens = 6
        snowsize = r.randint(1,10)
        for j in range(dens):
            t.fd(int(snowsize))
            t.backward(int(snowsize))
            t.right(int(360/dens))

drawsnow()
t.done()