效果图：（真实情况是动态的）

完整代码：

import turtle
import random# 初始化画布
turtle.bgcolor("#001f3f")  # 偏深蓝色的背景
turtle.title("下雪的画面")
turtle.speed(0)
turtle.hideturtle()
turtle.tracer(0)# 雪花的数量
num_snowflakes = 200
snowflakes = []# 创建雪花
for _ in range(num_snowflakes):x = random.randint(-300, 300)y = random.randint(0, 600)size = random.randint(2, 6)  # 随机大小fall_speed = random.uniform(3, 6)  # 增加下落速度snowflakes.append([x, y, size, fall_speed])def draw_snowflake(x, y, size):turtle.penup()turtle.goto(x, y)turtle.pendown()turtle.dot(size, "white")  # 使用随机大小的雪花def fall_snowflakes():turtle.clear()for snowflake in snowflakes:x, y, size, fall_speed = snowflakedraw_snowflake(x, y, size)# 更新雪花的位置y -= fall_speedif y < -300:  # 如果雪花落到屏幕底部，重置位置y = random.randint(600, 800)x = random.randint(-300, 300)size = random.randint(2, 6)  # 随机大小fall_speed = random.uniform(3, 6)  # 增加下落速度snowflake[0], snowflake[1], snowflake[2], snowflake[3] = x, y, size, fall_speed  # 更新雪花位置、大小和速度turtle.update()turtle.ontimer(fall_snowflakes, 20)  # 每20毫秒更新一次def main():fall_snowflakes()turtle.done()if __name__ == "__main__":main()