Poul-Henning Kamp added the comment:

Yes, it does:

If the O_APPEND flag of the file status flags is set, the file offset shall be 
set to the end of the file prior to each write and no intervening file 
modification operation shall occur between changing the file offset and the 
write operation.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15723>
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