Python跨模块全局变量管理：避免from import *陷阱

import pygame as Py

selectedSong = None

import pygame as Py # 假设Pygame已导入
import globals # 导入整个globals模块
import os

# 假设 screen 变量在 Pygame 初始化后可用
# screen = Py.display.set_mode((800, 600)) 

songs = os.listdir('./assets/songs')  

def generatePlaylist(font, event):
    for index, song in enumerate(songs):
        rectIndex = Py.Rect(20, 25 + (50 * (index + 1)), 260, 40)
        rectIndexPosition = (20, 25 + (50 * (index + 1)))
        rectIndexWidth = 260
        rectIndexHeight = 40
        Py.draw.rect(screen, 'gray', rectIndex) # 假设 screen 已定义
        text_surface = font.render(song, True, (0, 0, 0))
        text_rect = text_surface.get_rect(center=rectIndex.center)
        screen.blit(text_surface, text_rect)

        selected = selection(event, rectIndexPosition, rectIndexWidth, rectIndexHeight, song)
        if selected is not None:
            globals.selectedSong = selected # 使用 globals.selectedSong 引用和修改
            print(f"Playlist: selectedSong updated to {globals.selectedSong}") # 打印确认

        if index == len(songs) - 1:
            # ... 其他绘制代码 ...
            pass # 简化，省略不相关的绘制逻辑

def selection(event, rectIndexPosition, rectIndexWidth, rectIndexHeight, song):
    if event.type == Py.MOUSEBUTTONUP:
            if rectIndexPosition[0] <= event.pos[0] <= rectIndexPosition[0] + rectIndexWidth and \
               rectIndexPosition[1] <= event.pos[1] <= rectIndexPosition[1] + rectIndexHeight:
                return song
    return None

import globals # 导入整个globals模块
# from musicFunction import * # 假设 musicFunction 中的 play 函数需要导入

# 假设 imagePlayPosition 和 imagePlay 变量已在某处定义
# imagePlayPosition = (100, 100)
# imagePlay = Py.Surface((50, 50)) # 示例 Surface

def play():
    # 假设 mx.music 模块和 load, play 函数已导入或定义
    # import pygame.mixer as mx
    # mx.music.load(f'./assets/songs/{globals.selectedSong}')
    # mx.music.play()
    print(f"Playing: {globals.selectedSong}") # 模拟播放

def playButton(event):
   if event.type == Py.MOUSEBUTTONDOWN:
      # 假设 imagePlayPosition 和 imagePlay 已定义并可访问
      if imagePlayPosition[0] <= event.pos[0] <= imagePlayPosition[0] + imagePlay.get_width() and \
         imagePlayPosition[1] <= event.pos[1] <= imagePlayPosition[1] + imagePlay.get_height():
         print(f"ButtonMusic: current selectedSong is {globals.selectedSong}") # 打印确认
         if globals.selectedSong is not None: # 使用 globals.selectedSong 引用
            play()