mmap.mmap as a context manager

[briancurtin]

BPO	8046
Nosy	@birkenfeld, @briancurtin
Files	mmap_context_mgr.diff: patch against trunk

^{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 2010-08-01.14:50:07.134>
created_at = <Date 2010-03-03.03:39:51.541>
labels = ['type-feature', 'library']
title = 'mmap.mmap as a context manager'
updated_at = <Date 2010-08-01.14:50:07.133>
user = 'https://github.com/briancurtin'

bugs.python.org fields:

activity = <Date 2010-08-01.14:50:07.133>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2010-08-01.14:50:07.134>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2010-03-03.03:39:51.541>
creator = 'brian.curtin'
dependencies = []
files = ['16420']
hgrepos = []
issue_num = 8046
keywords = ['patch', 'needs review']
message_count = 2.0
messages = ['100331', '112336']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'brian.curtin']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = 'patch review'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue8046'
versions = ['Python 3.2']

[briancurtin]

Most file or file-like objects operate as context managers, except for mmap (and maybe a few others?). Attached is a patch with tests and documentation.

The patch also introduces an additional attribute to mmap, "closed".

[birkenfeld]

Thanks, adapted to current trunk and applied in r83406.