[docs] [issue12760] Add create mode to open()

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

I'm not sure that O_EXCL is portable (exist on all platforms) because Python source code uses "#ifdef O_EXCL".

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nosy: +haypo

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