Python 2.7.9 test_readline regression on CentOS 6

[vlee]

BPO	23092
Nosy	@berkerpeksag
Superseder	bpo-19884: Importing readline produces erroneous output

^{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 2014-12-20.07:25:36.422>
created_at = <Date 2014-12-20.02:39:45.943>
labels = ['type-bug', 'tests']
title = 'Python 2.7.9 test_readline regression on CentOS 6'
updated_at = <Date 2014-12-20.07:38:35.377>
user = 'https://bugs.python.org/vlee'

bugs.python.org fields:

activity = <Date 2014-12-20.07:38:35.377>
actor = 'vlee'
assignee = 'none'
closed = True
closed_date = <Date 2014-12-20.07:25:36.422>
closer = 'berker.peksag'
components = ['Tests']
creation = <Date 2014-12-20.02:39:45.943>
creator = 'vlee'
dependencies = []
files = []
hgrepos = []
issue_num = 23092
keywords = []
message_count = 3.0
messages = ['232957', '232965', '232966']
nosy_count = 2.0
nosy_names = ['berker.peksag', 'vlee']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '19884'
type = 'behavior'
url = 'https://bugs.python.org/issue23092'
versions = ['Python 2.7']

[vlee]

test_readline regressed from Python 2.7.8 to Python 2.7.9 on CentOS 6

Python 2.7.8
$ ./python -m test.regrtest test_readline
test_readline
1 test OK.

Python 2.7.9
$ ./python -m test.regrtest test_readline
[1/1] test_readline
test test_readline failed -- Traceback (most recent call last):
  File "Python-2.7.9/Lib/test/test_readline.py", line 56, in test_init
    self.assertEqual(stdout, b'')
AssertionError: '\x1b[?1034h' != ''

1 test failed:
test_readline

$ cat /etc/redhat-release
CentOS release 6.6 (Final)

$ rpm -qa | grep readline
readline-6.0-4.el6.x86_64
compat-readline5-5.2-17.1.el6.x86_64
readline-devel-6.0-4.el6.x86_64

[berkerpeksag]

This looks like a duplicate of bpo-19884.

[vlee]

The regression is introduced with this commit.

commit fa06e2bb13a3e67a0641025483efb19ef569dbd9
Author: Victor Stinner <victor.stinner@gmail.com>
Date: Thu Jul 24 12:22:24 2014 +0200

Issue bpo-19884: readline: Disable the meta modifier key if stdout is not a
terminal to not write the ANSI sequence "\033[1034h" into stdout. This sequence
is used on some terminal (ex: TERM=xterm-256color") to enable support of 8 bit
characters.