can a subclass method determine if called by superclass?

Ian Kelly ian.g.kelly at
Wed Jan 4 18:09:24 EST 2012

On Wed, Jan 4, 2012 at 3:42 PM, Peter <peter.milliken at> wrote:
> Situation: I am subclassing a class which has methods that call other
> class methods (and without reading the code of the superclass I am
> discovering these by trial and error as I build the subclass - this is
> probably why I may have approached the problem from the wrong
> viewpoint :-)).
> Problem: when overriding one of these "indirectly called" superclass
> methods I would like to take differing actions (in the subclass
> instance) depending on whether it is the superclass or the subclass
> instance performing the call.
> Question: Is there any way to determine in a method whether it is
> being called by the superclass or by a method of the subclass
> instance?

Well, you could get the previous stack level using
traceback.extract_stack() and check the filename.  But it sounds like
what you actually have are two different methods -- one that is used
by the superclass, and one that only the subclass knows about and
uses.  Why not implement it as such?

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