visibility between modules

[max(01)*]

hi.
if i have a single program file, different class instances can share 
information in (at least) two fashions:

1. using instance variables:
class AClass:
  def __init__(self):
    self.att_1 = 42
    self.att_2 = "Hello!"
class AnotherClass:
  def __init__(self):
    self.att_1 = anInstanceOfAClass.att_1
anInstanceOfAClass = AClass()
anInstanceOfAnotherClass = AnotherClass()
print anInstanceOfAnotherClass.att_1  ### This should print out 42
2. using globals:
class AClass:
  def __init__(self):
    self.att_1 = 42
    self.att_2 = "Hello!"
class AnotherClass:
  pass
aGlobalString = "No way."
anInstanceOfAClass = AClass()
anInstanceOfAClass.att2 = aGlobalString
anInstanceOfAnotherClass = AnotherClass()
anInstanceOfAnotherClass.att_1 = aGlobalString
print anInstanceOfAClass.att2  ### This should output "No way."
print anInstanceOfAnotherClass.att_1  ### And this too
----
i admit i prefer the fisrt way to do it. i have tried to make it work 
even if the "main program" and each class definition reside in different 
files, but i could not make it work:

[EMAIL PROTECTED]:/tmp$ cat AClass.py
class AClass:
  def __init__(self):
    self.att_1 = 42
    self.att_2 = "Hello!"
[EMAIL PROTECTED]:/tmp$ cat AnotherClass.py
class AnotherClass:
  def __init__(self):
    self.att_1 = anInstanceOfAClass.att_1
[EMAIL PROTECTED]:/tmp$ cat Main.py
from AClass import *
from AnotherClass import *
anInstanceOfAClass = AClass()
anInstanceOfAnotherClass = AnotherClass()
print anInstanceOfAnotherClass.att_1  ### This should print out 42
[EMAIL PROTECTED]:/tmp$ python Main.py
Traceback (most recent call last):
  File "Main.py", line 4, in ?
    anInstanceOfAnotherClass = AnotherClass()
  File "/tmp/AnotherClass.py", line 3, in __init__
    self.att_1 = anInstanceOfAClass.att_1
NameError: global name 'anInstanceOfAClass' is not defined
[EMAIL PROTECTED]:/tmp$
----
any suggestion?
bye max
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