set literals

[birkenfeld]

BPO	1547796
Nosy	@gvanrossum, @birkenfeld
Files	set-literals.diff: Support "bpo-" in Misc/NEWS #1

^{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/gvanrossum'
closed_at = <Date 2008-01-06.22:29:46.460>
created_at = <Date 2006-08-28.10:20:21.000>
labels = ['interpreter-core']
title = 'set literals'
updated_at = <Date 2008-01-06.22:29:46.460>
user = 'https://github.com/birkenfeld'

bugs.python.org fields:

activity = <Date 2008-01-06.22:29:46.460>
actor = 'admin'
assignee = 'gvanrossum'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2006-08-28.10:20:21.000>
creator = 'georg.brandl'
dependencies = []
files = ['7506']
hgrepos = []
issue_num = 1547796
keywords = ['patch']
message_count = 3.0
messages = ['50997', '50998', '50999']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'georg.brandl']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1547796'
versions = ['Python 3.0']

[birkenfeld]

A rough patch implementing {1, 2, 3}-style set literals.
There is no empty set literal.

[gvanrossum]

Logged In: YES
user_id=6380

Committed revision 51631.

despite two (related?) flaws:

(1)
../Python/symtable.c: In function symtable_visit_expr': ../Python/symtable.c:1209: warning: enumeration value Set_kind' not handled in switch

(2)
>>> {(x for x in range(10))}
KeyError: 'unknown symbol table entry'
>>> 

(Don't ask me why that was the third thing I tried with the
new syntax. :-)

Also, I'd love set comprehensions!

[birkenfeld]

Logged In: YES
user_id=849994

Okay, fixed the symtable issue.

Hopefully other people also do weird things with the new
syntax, the unit tests aren't very thorough (yet).