[Python-ideas] Standard way to get caller name and easy call stack access

Wed Mar 28 01:29:07 CEST 2012

Jim Jewett schrieb am Tue, 27. Mar 2012, um 16:06:51 -0400:
> On Tue, Mar 27, 2012 at 12:32 PM, Sven Marnach <sven at marnach.net> wrote:
> >  ...  Steven D'Aprano suggested giving full access to the function
> >   objects instead.  The function object cannot be referenced in the
> >   code object, though, because this would create reference cycles in
> >   CPython.
>> Not if you use weakrefs.
>> And frankly, even without weakrefs, so what? Functions are typically
> immortal; waiting until gc to collect the oddballs isn't such a terrible cost.

I didn't carefully think about this one. It's impossible to reference
the function object in the code object for a different reason: there
can be many function objects corresponding to the same code object.
So the discussion whether the reference cycle is tolerable is moot --
it's impossible anyway. If we want access to the function objects
from the stack trace, the only way to go is to add a reference to
frame objects.
Cheers,
 Sven