how to check the presence of attributes in a hierarchy ??

[ed_tsang at yahoo.com]

h is there a way to check the presence of attributes in a file 
arrangesof hierarchy? The number of levels iun the hirarchy is not 
known. 

In fileA,

CTF = 1

in fileB,

import fileA


....

in fileC,

import fileB

Note the levels of hirarchy isnot known.....
OR 

in fileC,

import fileA


fileC is the lowest level and CTF if defined ahs to be visible there.
I am not sure if I can use hasattr() call as I need to explicitly 
specify the full hierarchy down to the lowest level....

Thanks