[issue15723] Python breaks OS' append guarantee on file writes

[Charles-François Natali]

Charles-François Natali added the comment:

I wouldn't rely on O_APPEND too much:
- it won't work on NFS, and probably other non-local filesystems
- it doesn't actually guarantee atomicity, because even though the the file offset and the write is done with locking, there is still the possibility of partial write

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nosy: +neologix

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<http://bugs.python.org/issue15723>
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