Thanks for the answers. I do understand (and verified) that if I define f2 within f1, it works as expected. But in the "learning pyton 2nd edition" at page 205 it is said that "Programs are much simpler if you do not nest defs within defs" (juste before the code mentioned in my initial message).
In a way, I though the local variables of f1 would in a way add to the global variable of f2 (because f1 called f2) and that f2 would look in the global variables when it could not find a variable locally (following the LEGB rule). Still the code I put is presented in the book and it does not work for me. I googled for errata regarding that code but did not find any. Sébastien. -- http://mail.python.org/mailman/listinfo/python-list
