Steve Dower added the comment:

That would break paths like "\" or "D:\" ("D:" != "D:\" - the backslash is 
meaningful here), but I'm fairly sure _nt_quote_args could add '\\"' to the end 
if it ends in a backslash already (to escape the trailing slash):

     for i, arg in enumerate(args):
         if ' ' in arg:
-            args[i] = '"%s"' % arg
+            args[i] = '"%s%s"' % (arg, '\\' if arg.endswith('\\') else '')
     return args

For distutils, that's probably an okay fix since we're already quoting 
everything, and it doesn't try to make things too smart. But it would break 
people who are already escaping their own trailing backslash, and doesn't 
provide a workaround that will work both before and after this change. 
Especially for something like distutils, where people often have one setup.py 
for all Python versions, this is pretty important.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8987>
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