[issue12760] Add create mode to open()

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Here's a new version of the patch that should address all the comments.

Just a small note: FileExistsError is raised, not exactly OSError, when
the file exists.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12760>
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