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    <p>You are mixing two UI libraries together - that is not intrinsically bad, but there are some problems. Notably, both of them need a main loop of their own to process their events. TKinter uses it to communicate with the desktop and user-generated events, and in this case, pyglet uses it to play your music.</p> <p>Each of these loops prevents a normal "top down" program flow, as we are used to when we learn non-GUI programming, and the program should proceed basically with callbacks from the main loops. In this case, in the middle of a Tkinter callback, you put the pyglet mainloop (calling <code>pyglet.app.run</code>) in motion, and the control never returns to the Tkinter library.</p> <p>Sometimes loops of different libraries can coexist on the same process, with no conflicts -- but of course you will be either running one of them or the other. If so, it may be possible to run each library's mainloop in a different Python thread. </p> <p>If they can not exist together, you will have to deal with each library in a different process. </p> <p>So, one way to make the music player to start in another thread could be:</p> <pre><code>from threading import Thread def real_playsound () : sound = pyglet.media.load('music.mp3') sound.play() pyglet.app.run() def playsound(): global player_thread player_thread = Thread(target=real_playsound) player_thread.start() </code></pre> <p>If Tkinter and pyglet can coexist, that should be enough to get your music to start. To be able to control it, however, you will need to implement a couple more things. My suggestion is to have a callback on the pyglet thread that is called by pyglet every second or so -- this callback checks the state of some global variables, and based on them chooses to stop the music, change the file being played, and so on.</p>
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    1. POPlaying music with Pyglet and Tkinter in Python
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    1. USMichael Mrozek
    1. USjsbueno
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    1. COHi ok I have a better understanding. How exactly do I do a callback on the pyglet. From my basic understanding what you were suggesting is have a global variable that is set to some value whenever some button is pressed. If the stop button is pressed, then the value gets changed and the pyglet instance needs to stop. I understand how that would be implemented but how would you make sure the pyglet thread checks to see if this global variable is the correct value or not each second or so?
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      1. USPaul
 

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