Use `with` statement in dbm.dumb

[PCManticore]

BPO	21729
Nosy	@rhettinger, @PCManticore, @serhiy-storchaka
Files	dbm_with_open.patch

^{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 = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2014-06-25.17:49:51.729>
created_at = <Date 2014-06-12.07:24:41.807>
labels = ['type-feature', 'library']
title = 'Use `with` statement in dbm.dumb'
updated_at = <Date 2014-06-25.17:49:51.728>
user = 'https://github.com/PCManticore'

bugs.python.org fields:

activity = <Date 2014-06-25.17:49:51.728>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2014-06-25.17:49:51.729>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2014-06-12.07:24:41.807>
creator = 'Claudiu.Popa'
dependencies = []
files = ['35588']
hgrepos = []
issue_num = 21729
keywords = ['patch']
message_count = 5.0
messages = ['220335', '220379', '221559', '221561', '221563']
nosy_count = 4.0
nosy_names = ['rhettinger', 'Claudiu.Popa', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21729'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5']

[PCManticore]

Hello.

Here's a short patch for dbm.dumb, which uses in various places the with statement for opening and closing files. Thanks.

[rhettinger]

Serhiy, after reviewing this, consider backporting it.

The original code doesn't have a try/finally around the close() call and that could be considered a bug.

[serhiy-storchaka]

Ah, month ago I wrote large patch which use 'with' in various places in stdlib for opening and closing files. But then I dropped it because afraid that it can be considered as code churn.

[python-dev]

New changeset fdbcb11e0323 by Serhiy Storchaka in branch '3.4':
Issue bpo-21729: Used the "with" statement in the dbm.dumb module to ensure
http://hg.python.org/cpython/rev/fdbcb11e0323

New changeset e41b4e8c0c1d by Serhiy Storchaka in branch 'default':
Issue bpo-21729: Used the "with" statement in the dbm.dumb module to ensure
http://hg.python.org/cpython/rev/e41b4e8c0c1d

New changeset 893e79196fb3 by Serhiy Storchaka in branch '2.7':
Issue bpo-21729: Used the "with" statement in the dbm.dumb module to ensure
http://hg.python.org/cpython/rev/893e79196fb3

[serhiy-storchaka]

Thanks Claudiu.

Committed with yet one "with".