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

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

See also issue 12105.
A couple downsides:
- O_EXCL is not necessarily portable (doesn't work well with NFS, maybe not on Windows?)
- O_EXCL is useful, as is O_CLOEXEC: to be consistent, we should also end up adding all other commonly-used flags, which are really OS-specific

Furthermore, you can achieve the same thing with:
os.fdopen(os.open('/etc/fstab', os.O_WRONLY|os.O_CLOEXEC|os.O_CREAT))
it's more verbose, though.

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nosy: +neologix

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