py files includings each others

[Nicolas Bouillon]

Hi

I have a big problem while including file.
I have more that twenty classes, with one py file per class (more clear 
& clean), and the following test case illustrate well my problem. I 
facts, files including each other before the name of the classes seems 
to be defined, so python fails...

Can you help me to resolve that ?

a.py:
====
from b import Man

class Person:
     def __init__(self):
         pass

     def set_father(self):
         self.father = Father()
====

b.py
====
from a import Person

class Father(Person):
     def __init__(self):
         Person.__init__(self)

p = Father()
====

Runing:
====
bouil at lisa:/tmp$ python b.py
Traceback (most recent call last):
   File "b.py", line 1, in ?
     from a import Person
   File "/tmp/a.py", line 1, in ?
     from b import Man
   File "/tmp/b.py", line 1, in ?
     from a import Person
ImportError: cannot import name Person
bouil at lisa:/tmp$
====

Thanks you.