Dont perform implicit close/warning on __del__
#2026
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We currently attempt to perform a bit of hand-holding for cases where a client instance has not been closed at the point it is deleted. The reasoning here was to try to give users a bit more of a guard against unintentional resource leaks.
Our behaviour here was...
.close()clients on__del__, if they're still open.__del__, if they're still open.As it turns out, this just isn't reliable. We really can't do this properly, because if
__del__is called atatexitthen there's all sorted of bit of stdlib that may not be available. We can't reliably call intowarnings.warn, and it turns out we can't even reliably access the properties on anintenumclass. Geez.So. Let's just not do this anymore.
If you're leaking client instances (which as it happens, zillions of
requestsandurllib3using codebases currently already do.) Then okay, that's just the way it is. I'm not sure what flags you'd need to enable in python to have the system warn you about when that's the case, but we should rely on that level of warning, rather than attempting to add any ourselves.Better that we stick with the current status-quo, than attempt to do better and actually just end up with user-hostile exceptions or undefined behaviours.