Poul-Henning Kamp added the comment:

I have not tried io.open(), nor would I suspect most users would realize that 
they needed to do so, in order to get the canonical behaviour from an operation 
called "write" on a file opened in "append" mode.

IMO: If pythons file.write() does not give the guarantee POLA would indicate, 
it's either a bug or a doc-issue, no matter how many workarounds might exist.

But I have neither a clue to the aspirational goals of python, nor to what it 
might take to fix this, so it's entirely your call.

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