global variables

[David S.]

M.N.A.Smadi <smadim2 <at> grads.ece.mcmaster.ca> writes:

> I need to have a  varaible that will contain a value that will be 
> modified in one file, and when coming back to the same file it 
> should retain the same value. 

You must import the module in which the variable lives and qualify it
appropriately.  

So, if you have the following files

trash1.py
var = 1

trash2.py
import trash1
trash1.var = 2

trash3.py
import trash1
print trash1.var

you can run the interpreter and:
>>>import trash2
>>>import trash3
2