[PyQt] Using QModelIndex.internalPointer

[Bakuriu]

Hello.
I'm trying to create a model so I inheritad QAbstractItemModel and
implemented the necessary methods.
Now i'm stuck at implementing the "parent" method.

My model should navigate through a shelve db, which contains "Word"
objects(my custom objects).
These words should be separated by initials so that the tree view shows:

A-
  |-Letters
  |-Starting
  |-With
  |-A
B-
  |-Letters
  |-Starting
  |-With
  |-B
etc

Actually i use a wrapper class to access the shelve db which allows the tree
representation.
The problem is that when i call the QModelIndex.internalPointer method it
returns the class "Word" and not an instance of that class.
Therefore i cannot retrieve the parent index(my wrapper class also has got
methods which returns the index position of a word in the tree
representation using a tuple)

I read the documentation but it simply says that it returns a void*
pointer(in C++).
Anyone knows how to retrieve the exact data from a QModelIndex?

Ps:
In the index method i call createIndex passing the right row and column and
an instance of the object, not the class...

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