Update reprlib to use set literals

[rhettinger]

BPO	22824
Nosy	@rhettinger, @ezio-melotti, @berkerpeksag, @serhiy-storchaka
Files	issue22824.diff issue22824_v2.diff issue22824_3.diff

^{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/berkerpeksag'
closed_at = <Date 2014-11-10.06:31:33.556>
created_at = <Date 2014-11-09.03:22:18.761>
labels = ['easy', 'type-feature', 'library']
title = 'Update reprlib to use set literals'
updated_at = <Date 2014-11-15.18:59:09.853>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2014-11-15.18:59:09.853>
actor = 'python-dev'
assignee = 'berker.peksag'
closed = True
closed_date = <Date 2014-11-10.06:31:33.556>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2014-11-09.03:22:18.761>
creator = 'rhettinger'
dependencies = []
files = ['37163', '37164', '37165']
hgrepos = []
issue_num = 22824
keywords = ['patch', 'easy']
message_count = 8.0
messages = ['230880', '230922', '230923', '230924', '230935', '230936', '230942', '231213']
nosy_count = 5.0
nosy_names = ['rhettinger', 'ezio.melotti', 'python-dev', 'berker.peksag', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue22824'
versions = ['Python 3.5']

[rhettinger]

Currently reprlib outputs:

    >>> reprlib.repr(set('supercalifragilisticexpialidocious'))
    "set(['a', 'c', 'd', 'e', 'f', 'g', ...])"

This should be:

"{'a', 'c', 'd', 'e', 'f', 'g', ...}"

[berkerpeksag]

Here's a patch to use set literals and frozenset({'a'}) in reprlib.

[rhettinger]

That looks great. Go ahead an apply (with a MISC/NEWS entry and an update to the example on line 22 of Docs/tutorial/stdlib2.rst).

[berkerpeksag]

Thanks for the review, Raymond. Patch updated:

• Updated the documentation
• Added two test cases for set literals
• Replaced old run_unittest calls with unittest.main()

[python-dev]

New changeset 147fda13bec8 by Raymond Hettinger in branch 'default':
Issue bpo-22824: Updated reprlib output format for sets to use set literals.
https://hg.python.org/cpython/rev/147fda13bec8

[rhettinger]

Thanks for the patch.

[serhiy-storchaka]

The repr of empty array() should be fixed too.

[python-dev]

New changeset cf5b910ac4c8 by Raymond Hettinger in branch 'default':
Issue bpo-22824: Simplify reprlib output format for empty arrays
https://hg.python.org/cpython/rev/cf5b910ac4c8