[issue7545] IO buffering behaviour not properly documented

[Pascal Chambon]

Pascal Chambon <chambon.pascal at gmail.com> added the comment:

Yep, I knew "full buffering" didn't mean "fill my RAM until crash" :p 
The only visible problem was the interpretation of positive/negative
buffering value, which wasn't the same in doc and in code. But the patch
seems to fix up the plot prettily well B-)
Thanks

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<http://bugs.python.org/issue7545>
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