inspect.stack() and frame

MRAB python at
Fri Mar 12 16:47:10 CET 2010

Félix-Antoine Fortin wrote:
> Thanks Gabriel, you resumed quite well what I did discovered after my
> second post
> by playing with the garbage collector module.
>> (The garbage collector will,  
>> eventually, break the cycle and free those objects, but not very soon).
> I'm not very familiar with the Python garbage collector, so you may
> excuse my
> simple question, but how can it break the cycle? I guess the object
> will be
> freed at least when the program ends, but could it be before that? Is
> there a
> mechanisme in the garbage collector to detect circular references?
In CPython objects are reference-counted, which allows an object to be
collected as soon as there are no references to it.

However, this won't take care of circular references, so a secondary
garbage collector was introduced which occasionally looks for
inaccessible objects (garbage) using (probably) mark-and-sweep.

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