import error?

[Tom]

Hi folks,

I have a really strange problem. I have a module and at the beginning I 
include some others by:
from xxx import *
works perfectly except for one import. I always get an error saying:
NameError: global name 'yyy' is not defined (yyy is a function in xxx)

I don't understand that. I checked everything and I have no typos in my 
code.
If I copy the import line from the beginning of my module and paste it 
right before I refere to it in the function (which is of course 
extreemly bad programming, but I just did that to find the error) it 
works. I don't get it. Shouldn't it work if I import it at the beginning 
of the code? It works for all the other modules I import!! I have no 
typos and all the other imports work. Also the module itself works, I 
checked that, but I get this name error and I don't understand that. :-(

Thanks for your help.
Regards, Tom