```python
import turtle
import random
# 设置画布
turtle.setup(800, 600)
turtle.bgcolor("skyblue")
# 创建画笔
pen = turtle.Turtle()
pen.speed(0)
pen.width(3)
# 定义颜列表
colors = ["red", "orange", "yellow", "green", "blue", "purple"]
# 定义圣诞树的层数
tree_layers = 5
# 画圣诞树
def draw_tree(x, y, size):
    pen.up()
    (x, y)
    pen.down()
    lor(random.choice(colors))
    pen.begin_fill()
    for _ in range(3):
        pen.forward(size)
        pen.left(120)
    d_fill()
    if size > 30:
        draw_tree(x - size / 2, y - size * 2 / 3, size / 2)
        draw_tree(x + size / 2, y - size * 2 / 3, size / 2)
# 画雪花
def draw_snowflake(x, y, size):
    pen.up()
    (x, y)
    pen.down()
    lor(random.choice(colors))
    pen.begin_fill()
    for _ in range(3):
        pen.forward(size)
        pen.backward(size)
        pen.right(120)
random python    d_fill()
# 画星星
def draw_star(x, y, size):
    pen.up()
    (x, y)
    pen.down()
    lor(random.choice(colors))
    pen.begin_fill()
    for _ in range(5):
        pen.forward(size)
        pen.right(144)
    d_fill()
# 主程序
for i in range(tree_layers):
    draw_tree(0, -i * 30, 30 + i * 10)
for _ in range(100):
    x = random.randint(-350, 350)
    y = random.randint(-250, 250)
    size = random.randint(5, 20)
    draw_snowflake(x, y, size)
for _ in range(50):
    x = random.randint(-350, 350)
    y = random.randint(-250, 250)
    size = random.randint(3, 10)
    draw_star(x, y, size)
turtle.done()
```

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