python怎么用turtle画圣诞树

使用turtle库可以很方便地绘制圣诞树，下面是一个示例代码：

import turtle

def draw_triangle(size):
    turtle.begin_fill()
    for _ in range(3):
        turtle.forward(size)
        turtle.left(120)
    turtle.end_fill()

def draw_tree(size, level):
    if level == 0:
        turtle.color("green")
        draw_triangle(size)
        turtle.color("black")
    else:
        turtle.color("brown")
        turtle.forward(size/2)
        turtle.right(30)
        draw_tree(size/2, level-1)
        turtle.left(30)
        turtle.backward(size/2)
        turtle.right(60)
        draw_tree(size/2, level-1)
        turtle.left(60)
        turtle.backward(size/2)
        turtle.right(30)
        turtle.color("green")
        draw_triangle(size)

def draw_star(size):
    turtle.color("yellow")
    turtle.begin_fill()
    for _ in range(5):
        turtle.forward(size)
        turtle.right(144)
    turtle.end_fill()

# 设置画布大小和背景色
turtle.setup(800, 600)
turtle.bgcolor("white")

# 移动到树的底部中心位置
turtle.penup()
turtle.goto(0, -250)
turtle.pendown()

# 绘制圣诞树
draw_tree(200, 4)

# 移动到星星的位置
turtle.penup()
turtle.goto(0, 0)
turtle.pendown()

# 绘制星星
draw_star(50)

# 隐藏画笔
turtle.hideturtle()
turtle.done()

运行以上代码，即可在turtle图形窗口中看到绘制的圣诞树和星星。