Charles-François Natali added the comment:

I don't comfortable exposing this.
The main reason is that this flag is really non-portable.
Having open() fail at runtime because the platform doesn't support it looks 
really wrong to me. And silently ignore it is even worse.
The 'x' flag was added because it is useful, on available on all platforms (I 
mean, even Windows has it). Here's, it's by definition Unix-specific, and even 
then, many Unices don't support it.
So I'm -1.

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<http://bugs.python.org/issue16850>
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