[issue30504] Allow inspecting buffering attribute of IO objects

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

>>> sys.stdout.line_buffering
True

For buffered streams I would expect the attribute named "buffer_size", conforming to the name of the parameter of the constructor.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30504>
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