Adding member to ast_node class

For assigning contexts to a node.... i need'd to add a
ducontext to the 
ast_node struct in python like its done in Cpp's ast.h .
The python_parser, python_ast are generated.
So how do we accomplish this?
-- 
Regards,
Piyush Verma
0091-9811261908
Email:piyush.vermagmail.com
Work: piyushphire.com

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