ovidiu@ovibox:/data/Projects/python/modules$ cat a.py
a='asdf'
b='pupu'
ovidiu@ovibox:/data/Projects/python/modules$ cat b.py
import a
import c
print a.a
a.a='tralala'
c.blah()

ovidiu@ovibox:/data/Projects/python/modules$ cat c.py
import a
def blah():
    print a.a

ovidiu@ovibox:/data/Projects/python/modules$ python b.py
asdf
tralala
ovidiu@ovibox:/data/Projects/python/modules$