Steve Dower <steve.do...@python.org> added the comment:

I agree. We should definitely document it as a change, but I don't think 
there's anything useful you can do in the case of a flush failing anyway, so it 
seems unlikely that anyone could depend on the return value.

Returning None for success and exception on error sounds like a good change. 
Technically this is no longer returning zero, as previously documented, so if 
anyone wants to get *really* pedantic, we're not returning the "failed" result 
for success ;)

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<https://bugs.python.org/issue2122>
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