Allow inspecting buffering attribute of IO objects

[pitrou]

BPO	30504
Nosy	@pitrou, @benjaminp, @serhiy-storchaka

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-05-29.08:59:06.599>
labels = ['type-feature', '3.7', 'expert-IO']
title = 'Allow inspecting buffering attribute of IO objects'
updated_at = <Date 2017-05-31.16:13:25.672>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2017-05-31.16:13:25.672>
actor = 'pitrou'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['IO']
creation = <Date 2017-05-29.08:59:06.599>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 30504
keywords = []
message_count = 3.0
messages = ['294683', '294685', '294849']
nosy_count = 4.0
nosy_names = ['pitrou', 'benjamin.peterson', 'stutzbach', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30504'
versions = ['Python 3.7']

[pitrou]

It would be useful to be able to inspect the buffering attribute of buffered and text I/O objects, especially for debugging.

I would expect e.g.:

>>> sys.stdout.buffering
1   # line-buffered
>>> sys.stdout.buffer.buffering
8192

[serhiy-storchaka]

>>> 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.

[pitrou]

Ah, I had forgotten about the line_buffering attribute. Thank you.