[fcntl]how to lock a file

[Eric S. Johansson]

marcello wrote:
> Hello
> I need to do this:
> 1 opening a file for writing/appending
> 2 to lock  the file as for writing (i mean: the program
> that lock can  keep writing, all others programs can't )
> 3 wtite and close/unlock

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203

been using it for years and it makes locking really simple.  I have no 
idea why the main Python distribution is missing such an important piece 
of functionality.