This is a patch for the bug described at:

www.python.org/sf/513572

The patch adds two new routines to posixmodule.c: 
IsUNCRootA and IsUNCRootW which test if a supplied 
path matches the pattern for a UNC root directory.  
These routines are called by posix_do_stat in two 
different places: 1) when testing if a path with a 
trailing slash is a drive root and 2) to see if a path 
without a trailing slash is a UNC root.

The first of these is the real bug fix; it allows UNC roots 
to be specified as "//server/share/" rather 
than "//server/share//".

The second was added because it is easy to forget to 
add the trailing slash to "//server/share", but stats of 
UNC roots without the trailing slash will fail.  However, I 
think this is an optional addition.

I'm not sure what to do about tests, since existing 
shares will obviously vary from system to system, and 
it seems to me that the test suite should not 
temporarily add a share just to test this feature.

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Thanks for the patch. Applied as 
posixmodule.c 2.318 2.300.8.10
NEWS 1.982 1.831.4.113