Get reference to "owner"

[Robert Oschler]

I've never seen this feature in any programming language I've worked in but
it can't hurt to ask.  Can an aggregated class object get a reference to the
class object that aggregates it?  So if ClassAggregator contained an
instance of ClassAggregatee is there a Python syntax/construct that a
function in ClassAggregatee could use to get a reference to the instance of
ClassAggregator that contained it?

Thanks.