HOW TO build object graph or get superclasses list for self.__class__ ?

[James Mills]

On Wed, Apr 21, 2010 at 3:35 PM, Dmitry Ponyatov <forth at km.ru> wrote:
> Hello
>
> Help please with such problem:
>
> I need to build program object graph (data structure) with additional
> parameters for nodes and edges:
>
> include nxgraph # data structure module allowes any py objects for
> node/edge id
> # (nxgraph ignores 2+ node/edge adding thus no checking need at node/
> edge adding)
>
> OBJ_TREE = nxgraph.DiGraph() # directed graph
>
> OBJ_TREE.add_node(object,color='red') # root object
>
> class A(object):
>    def __init__(self):
>        object.__init__(self) # (1) maybe map(lambda
> s:s.__init__(self), self.__super__) better if I have __super__
>        OBJ_TREE.add_node(self.__class__,color='red') # (2) add self
> class as new node
>        for SUP in self.__super__:
>            OBJ_TREE.add_edge(SUP,self.__class__,color='red') # (3)
> add super class
>                                  # to self class red arrow (directed
> edge)
>        OBJ_TREE.add_node(self,color='blue') # (4) add self object
> instance node
>        OBJ_TREE.add_edge(self.__class__,self,color='blue') # (5) add
> object producing from class edge
>        OBJ_TREE.plot(sys.argv[0]+'.objtree.png') # dump obj tree as
> picture to .png file
>
> class B(A):
>    pass
>
> class C(A):
>    pass
>
> Using Python 2.5 I can't realize line (3) in A class, but lines 2) (4)
> (5) works well
> How can I realize some function get_super(self) giving list of
> superclasses for self.__class__ ?
> Preferable using py2.5
>
> How days I must reimplement __init__ by dumb copy from parent class to
> child class like
>
> class B(A):
>    def __init__(self):
>        A.__init__(self)
>        OBJ_TREE.add_node(A,B) ; OBJ_TREE.plot('OBJ_TREE.png')
>
> class C(A):
>    def __init__(self):
>        A.__init__(self)
>        OBJ_TREE.add_node(A,C) ; OBJ_TREE.plot('OBJ_TREE.png')
>
> class D(B,C):
>    def __init__(self):
>        B.__init__(self) ; OBJ_TREE.add_node(B,D)
>        C.__init__(self) ; OBJ_TREE.add_node(C,D)
>        OBJ_TREE.plot('OBJ_TREE.png')
>
> This is not good -- a lot of dumb code with chance to make mistakes

Why not make things simple and just write a function
that computes the edges of a class tree ? Something like this:

http://codepad.org/xWKDlS52

cheers
James