os.open and O_EXCL

[Ethan Furman]

Greetings!

I am trying to lock a file so no other process can get read nor write 
access to it.  I thought this was possible with os.open(filename, 
os.O_EXCL), but that is not working.  I am aware of the win32file option 
to do file locking, so my question is this:  what is the purpose of the 
os.O_EXCL flag?

Thanks for any help.
--
Ethan
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