Tiny patch for bug 612074: sre unicode escapes

[glchapman]

BPO	681152
Nosy	@loewis

^{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 2003-04-19.08:40:45.000>
created_at = <Date 2003-02-05.19:23:54.000>
labels = ['library']
title = 'Tiny patch for bug 612074: sre unicode escapes'
updated_at = <Date 2003-04-19.08:40:45.000>
user = 'https://bugs.python.org/glchapman'

bugs.python.org fields:

activity = <Date 2003-04-19.08:40:45.000>
actor = 'loewis'
assignee = 'effbot'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2003-02-05.19:23:54.000>
creator = 'glchapman'
dependencies = []
files = []
hgrepos = []
issue_num = 681152
keywords = ['patch']
message_count = 2.0
messages = ['42684', '42685']
nosy_count = 3.0
nosy_names = ['loewis', 'effbot', 'glchapman']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue681152'
versions = ['Python 2.3']

[glchapman]

Bug report 612074 points out that this raises an
exception:

import re 
a = unichr(0x2039) 
b = u"["+re.escape(a)+u"]" 
re.compile(b) 

The exception is raised by an unnecessary call to str in
sre_parse.py (in the function _class_escape); str
(u'\u2039') raises a UnicodeError. The call is
unnecessary because (for example) u'1' == '1', so no
type conversion is necessary to test for membership in
OCTDIGITS.

[loewis]

Logged In: YES
user_id=21627

Thanks for the patch. Committed as

sre_parse.py 1.57
test_sre.py 1.40
sre_parse.py 1.51.6.1
test_sre.py 1.35.6.1