《Python程序设计》习题与答案

import threading class wxGUI(wx.App): def OnInit(self):

frame = wx.Frame(parent=None, title='MP3Player', size=(250,150), pos=(350,350)) panel = wx.Panel(frame, -1)

self.buttonOK = wx.Button(panel, -1, 'Play', pos=(30,60)) self.Bind(wx.EVT_BUTTON, self.OnButtonOK, self.buttonOK) self.buttonOK.Enabled = True

self.buttonCancel = wx.Button(panel, -1, 'Stop', pos=(120,60)) self.Bind(wx.EVT_BUTTON, self.OnButtonCancel, self.buttonCancel) self.buttonCancel.Enabled = False frame.Show() return True def OnExit(self): try:

self.playing = False

pygame.mixer.music.stop() finally: pass

def play(self):

folder = r'h:\\music'

musics = [folder+'\\\\'+music for music in os.listdir(folder) if music.endswith('.mp3')] total = len(musics)

pygame.mixer.init() while self.playing:

if not pygame.mixer.music.get_busy(): nextMusic = random.choice(musics) pygame.mixer.music.load(nextMusic) pygame.mixer.music.play(1) print 'playing....',nextMusic else:

time.sleep(1)

def OnButtonOK(self, event): self.playing = True

# create a new thread to play music t = threading.Thread(target=self.play) t.start()

self.buttonOK.Enabled = False self.buttonCancel.Enabled = True def OnButtonCancel(self, event): self.playing = False

pygame.mixer.music.stop() self.buttonOK.Enabled = True self.buttonCancel.Enabled = False

app = wxGUI() app.MainLoop()

15.5 运行本章15.4中的代码并查看运行结果。 答：略。

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