>
> As before, this is *completely untested*.  Please read the code
> carefully and see if it makes sense.  I'll go give it a shot on Linux
> now; Graham, can you please give it a try on Windows?  Also, can someone
> test to see if O_EXCL actually works on Windows?


I'll try to test it tonight.

In the meantime, running this on Windows:

     import os
     f = open('1.txt', 'w')
     f.write('hello')
     f.close()
     f2 = os.fdopen(os.open('1.txt', os.O_WRONLY | os.O_EXCL | os.O_CREAT))

returns:

     Traceback (most recent call last):
       File "C:\temp\1.py", line 7, in ?
         f2 = os.fdopen(os.open('1.txt', os.O_WRONLY | os.O_EXCL |
os.O_CREAT))
     OSError: [Errno 17] File exists: '1.txt'


That's great! I thought I had to use the nasty win32file API to do that.
Thanks!

-- Graham