Get containing python class from element
<p>Assuming I have a instance of class A (name it AI)
that has an instance of class B (name it BI).
Can a reference to BI (somewhere else) tell me that it is part of AI?</p>

<p>I don't talk about inheritance/parent class.</p>

<p>I know I can do this by implementing a reference to A
in the constructor of B - but can mighty Python do it for me?</p>
