[issue5323] document expected/required behavior of 3.x io subsystem with respect to buffering

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I have now had time to test this.  My use case (reading text from a pipe
and wanting the most recent complete line returned immediatly as it
is avaialable) is satisified by both the io.py code and the io c
code from the py3k branch.  I haven't been able to figure out how
to write an automated test, though :(.

I also had a fun time (I mean that literally) wandering through the code
and docs convincing myself that the 3.1a0 docs cover all the issues I
raised in this ticket.  I played around with a test case that helped
convince me the implementations match the 3.1a0 docs for the issues I
was concerned about.

So, IMO this ticket can be closed as fixed in 3.1a0.

--RDM

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