[Zope] Functions in a python script

[Gilles Lenfant]

Hi,

I found a strange behaviour for a small script that runs correctly in pure
Python:
== SNIP ==
foo = 'a great text'

def bar():
  # error below
  return foo

return bar()
==/SNIP==
It makes a "NameError" on "foo" !!!
If the first line of bar() is "global foo", this does not change anything.

How to use python functions inside Zope python scripts ?
Is it reserved for External methods ?
Should I provide all "globals" as arguments to the function ?