[Python-Dev] Resource leaks warnings

[Antoine Pitrou]

Le mercredi 29 septembre 2010 à 07:27 -0500, Benjamin Peterson a écrit :
> >
> > I would like to piggy-back on this discussion to suggest further
> > warnings (either by default, or switchable).
> >
> > One feature I've often considered would be to add a warning in FileIO
> > and socket dealloc if these objects haven't been closed explicitly. In
> > most situations, relying on garbage collection to shutdown OS resources
> > (here, file descriptors) is something we like to discourage.
> > Furthermore, it can produce real bugs, especially under Windows when
> > coupled with refererence cycles created by traceback objects (the
> > random test_tarfile failures on the Windows buildbots were a symptom of
> > that; their cause would have been obvious with such warnings).
> >
> > What do you think?
> 
> It seems like a slippery slope. Sometimes you really don't care like
> when you're just hacking together a quick script.

Isn't the "with" statement appropriate in these cases?

My assumption is/was that the benefit of warning against leaks in real
applications (or even - sigh - the standard library) would outweigh the
inconvenience when hacking together a quick script.

But if it doesn't, what about enabling it with a command-line switch?