Why sfml does not play the file inside a function in this python code?

[MRAB]

On 07/05/2013 14:56, cheirasacan at gmail.com wrote:
> El martes, 7 de mayo de 2013 12:53:25 UTC+2, MRAB  escribió:
>> On 07/05/2013 10:27, cheirasacan at gmail.com wrote:
>> > from tkinter import *
>> > import sfml
>> >
>> > window = Tk()
>> > window.minsize( 640, 480 )
>> >
>> > def sonido():
>> >      file = sfml.Music.from_file('poco.ogg')
>> >      file.play()
>> >
>> > test = Button ( window, text = 'Sound test', command=sonido )
>> > test.place ( x = 10, y = 60)
>> >
>> > window.mainloop()
>> >
>> > Using Windows 7, Python 3.3, sfml 1.3.0 library, the file it is played if i put it out of the function. � what am i doing wrong ? Thanks.
>> >
>>
>> Perhaps what's happening is that sonido starts playing it and then
>> returns, meaning that there's no longer a reference to it ('file' is
>> local to the function), so it's collected by the garbage collector.
>>
>> If that's the case, try keeping a reference to it, perhaps by making
>> 'file' global (in a simple program like this one, using global should
>> be OK).
>
> Thanks. A global use of 'sonido' fix the problem. The garbage collector must be the point. But this code is part of a longer project. What can i do to fix it without the use of globals? I will use more functions like this, and i would like to keep learning python as well good programming methodology.
> Thanks.
>
Presumably the details of the window are (or will be) hidden away in a
class, so you could make 'file' an attribute of an instance.

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