python精美圣诞树

### 使用Python绘制精美的圣诞树

为了实现这一目标，可以采用`turtle`库来完成。此库非常适合用于图形绘制，并且易于上手。

下面是一个较为复杂的例子，不仅包含了基本结构——树干与分层的树叶部分，还增加了额外元素如星星顶部装饰、彩色灯泡点缀等，使得整个图像更加生动有趣[^2]：

import turtle
from random import randint, choice

colors = ['red', 'blue', 'yellow', 'pink', 'orange']

def draw_star(size):
    angle = 140
    turtle.speed('fastest')
    for _ in range(5):
        turtle.forward(size)
        turtle.right(angle)

def draw_ball(radius):
    turtle.penup()
    position_x = randint(-80, 80)
    position_y = randint(-70, 90)
    turtle.goto(position_x,position_y )
    color_choice = choice(colors)
    turtle.color(color_choice)
    turtle.begin_fill()
    turtle.circle(radius)
    turtle.end_fill()

def draw_trunk():
    turtle.penup()
    turtle.goto(-15,-100)
    turtle.pendown()
    turtle.color("brown")
    turtle.begin_fill()
    for i in range(2):  
        turtle.forward(30)   
        turtle.left(90)      
        turtle.forward(60)    
        turtle.left(90)       
    turtle.end_fill()        

def draw_tree_body():
    heights=[60, 50 ,40 ] 
    widths =[120 ,100 ,80 ]
    positions=[-60 ,-50 ,-40]

    for height,width,pos in zip(heights,widths,positions):
        turtle.penup()
        turtle.goto(pos,height)
        turtle.pendown()
        turtle.color("green") 
        turtle.begin_fill()
        for j in range(3):
            turtle.forward(width)
            turtle.left(120)
        turtle.end_fill()

screen=turtle.Screen()
screen.bgcolor("light blue")

draw_trunk()
draw_tree_body()
for k in range(10):
    draw_ball(10)
draw_star(100)

turtle.done()

这段程序通过定义不同的函数分别处理各个组件的绘制工作，包括但不限于树干(`draw_trunk`)、主体(`draw_tree_body`)、装饰品(`draw_ball`)以及星形顶饰(`draw_star`)。最后调用了这些方法并适当设置了背景颜色以增强视觉效果。