Python 音乐播放器类：面向对象设计与实现

class MusicPlayer: def init(self, name, song_list=[]): self.name = name self.song_list = song_list self.current_song = None

def play(self):
    if self.current_song is None:
        print("No song is selected.")
    else:
        print("Playing:", self.current_song)

def pause(self):
    if self.current_song is None:
        print("No song is selected.")
    else:
        print("Pausing:", self.current_song)

def next_song(self):
    if self.song_list:
        if self.current_song is None:
            self.current_song = self.song_list[0]
        else:
            current_index = self.song_list.index(self.current_song)
            if current_index == len(self.song_list) - 1:
                self.current_song = self.song_list[0]
            else:
                self.current_song = self.song_list[current_index + 1]
        print("Switched to:", self.current_song)
    else:
        print("No song is available.")

music_player = MusicPlayer("My Music Player", ["Song 1", "Song 2", "Song 3"]) music_player.play() music_player.pause() music_player.next_song() music_player.next_song() music_player.play()