[issue7545] IO buffering behaviour not properly documented

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> But now the question remains what the default is -- "full buffering" is
> only meaningful with a specified buffer size.  The implementation seems
> to default to line buffering.

"full" buffering actually uses a default or custom buffer size when you
don't specify it. 4096 or 8192 usually (yes there's a heuristic :-)).

"full" buffering is the default for binary streams, as well as for text
streams which aren't a tty. text streams which are tty default to line
buffering.

(I admit full buffering is a confusing name; what could we use instead?
fixed-size buffering? chunk buffering?)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7545>
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