Add __enter__ and __exit__ methods to StringIO/cStringIO classes

[peppergrower]

BPO	4039
Nosy	@loewis, @benjaminp

^{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 = <Date 2008-10-04.15:49:25.809>
created_at = <Date 2008-10-04.11:06:09.999>
labels = ['interpreter-core', 'type-feature']
title = 'Add __enter__ and __exit__ methods to StringIO/cStringIO classes'
updated_at = <Date 2008-10-04.15:49:25.807>
user = 'https://bugs.python.org/peppergrower'

bugs.python.org fields:

activity = <Date 2008-10-04.15:49:25.807>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2008-10-04.15:49:25.809>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2008-10-04.11:06:09.999>
creator = 'peppergrower'
dependencies = []
files = []
hgrepos = []
issue_num = 4039
keywords = []
message_count = 3.0
messages = ['74309', '74310', '74315']
nosy_count = 3.0
nosy_names = ['loewis', 'benjamin.peterson', 'peppergrower']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue4039'
versions = ['Python 2.7']

[peppergrower]

Currently, StringIO objects do not have __enter__ and __exit__ methods
associated with them. As a result, the 'with' statement won't work
properly on StringIO objects in a construction like the following,
though they can otherwise be manipulated like files:

with obj.open_file(...) as f:
    ... 

(I brought up this behavior first on comp.lang.python,* and the above
example was borrowed from Hrvoje Niksic.) To allow StringIO objects to
be used more interchangeably with actual file objects, could __enter__
and __exit__ methods be added?

Thanks,
peppergrower

http://groups.google.com/group/comp.lang.python/browse_thread/thread/6bdf65bce431e404/a5dc64f43147f4dd?lnk=gst

[loewis]

Certainly not for 2.5 or 2.6. Targetting this as 2.7.

[benjaminp]

This is a duplicate of bpo-1286.