帮我做一个Python窗口画飘雪

以下是一个简单的Python窗口画飘雪的代码：

import random
import tkinter as tk

class Snowflake:
    def __init__(self, canvas):
        self.canvas = canvas
        self.id = None
        self.x = 0
        self.y = 0
        self.vx = 0
        self.vy = 0
        self.size = 0

    def create(self):
        self.size = random.randint(10, 30)
        self.x = random.randint(0, self.canvas.winfo_width())
        self.y = -self.size
        self.vx = random.randint(-2, 2)
        self.vy = random.randint(1, 3)

        self.id = self.canvas.create_oval(self.x, self.y, self.x+self.size, self.y+self.size, fill='white')

    def move(self):
        self.x += self.vx
        self.y += self.vy

        if self.x > self.canvas.winfo_width() + self.size or self.x < -self.size or self.y > self.canvas.winfo_height() + self.size:
            self.canvas.delete(self.id)
            return False

        self.canvas.coords(self.id, self.x, self.y, self.x+self.size, self.y+self.size)
        return True

class Snow:
    def __init__(self, num_flakes):
        self.num_flakes = num_flakes
        self.flakes = []
        self.canvas = tk.Canvas(width=800, height=600)
        self.canvas.pack()

    def create(self):
        for i in range(self.num_flakes):
            flake = Snowflake(self.canvas)
            flake.create()
            self.flakes.append(flake)

    def move(self):
        for flake in self.flakes:
            if not flake.move():
                self.flakes.remove(flake)

    def run(self):
        self.create()
        while True:
            self.move()
            self.canvas.update()
            self.canvas.after(50)

snow = Snow(50)
snow.run()

这个代码将创建一个大小为800x600的窗口，并在其中绘制50个不同大小的随机飘雪。飘雪会从窗口上方开始，向下移动，并在窗口底部消失。每个飘雪的速度和方向都是随机的。窗口会每50毫秒更新一次，从而制造出飘雪的动态效果。