[Python-Dev] bpo-36829: Add sys.unraisablehook() (original) (raw)

Victor Stinner vstinner at redhat.com
Thu May 16 18:17:00 EDT 2019

Le jeu. 16 mai 2019 à 23:46, Nathaniel Smith <njs at pobox.com> a écrit :

A clever hook might want the actual object, so it can pretty-print it, or open an interactive debugger and let it you examine it, or something. Morally this is similar to calling repr(obj), but it doesn't literally call repr(obj).

Good point. By the way, I started to use tracemalloc.get_object_traceback(obj) to display where the object comes from more and more often :-D It helps me at least in debugging. So yeah, I would prefer to pass directly the object to the hook.

For example, I'm using it with the "source" parameter of a ResourceWarning: https://pythondev.readthedocs.io/debug_tools.html#resourcewarning

But also when a buffer underflow or overflow is detected by debug hooks on Python memory allocators: https://pythondev.readthedocs.io/debug_tools.html#pythonmalloc-debug

It might also help me sometimes to be able to call tracemalloc.get_object_traceback(obj) from a custom unraisablehook().

Victor

Night gathers, and now my watch begins. It shall not end until my death.

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