用python写下雨代码，动态展示

可以使用Python的pygame库来实现下雨效果。以下是示例代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 屏幕的尺寸
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

# 雨滴的颜色
RAIN_COLOR = (200, 200, 255)

# 创建屏幕对象
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))

# 雨滴列表
raindrops = []

# 添加新雨滴的函数
def add_raindrop():
    x = random.randint(0, SCREEN_WIDTH)
    y = random.randint(-SCREEN_HEIGHT, 0)
    velocity = random.randint(10, 20)
    size = random.randint(1, 3)
    raindrops.append({'x': x, 'y': y, 'velocity': velocity, 'size': size})

# 渲染雨滴的函数
def render_raindrops():
    for raindrop in raindrops:
        x = raindrop['x']
        y = raindrop['y']
        size = raindrop['size']
        pygame.draw.line(screen, RAIN_COLOR, (x, y), (x, y + size))
        
# 移动雨滴的函数
def update_raindrops():
    for raindrop in raindrops:
        raindrop['y'] += raindrop['velocity']
        if raindrop['y'] > SCREEN_HEIGHT:
            raindrops.remove(raindrop)

# 游戏循环
running = True
while running:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
            
    # 添加新雨滴
    if random.randint(0, 50) == 0:
        add_raindrop()
        
    # 清屏
    screen.fill((0, 0, 0))
    
    # 渲染雨滴
    render_raindrops()
    
    # 移动雨滴
    update_raindrops()
    
    # 更新屏幕
    pygame.display.flip()
    
# 退出pygame
pygame.quit()

这段代码会在屏幕上动态展示下雨的效果。你可以根据自己的需要调整参数，比如修改屏幕尺寸、调整雨滴的大小和速度等等。