No locale alias mapping key for en_IL

[Licht-T]

BPO	33432
Nosy	@serhiy-storchaka, @Licht-T
PRs	bpo-33432: Add en_IL support into the locale alias mapping #6707
Superseder	bpo-20087: Mismatch between glibc and X11 locale.alias

^{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 2018-05-05.12:42:29.534>
created_at = <Date 2018-05-05.12:18:32.528>
labels = ['type-bug', 'library']
title = 'No locale alias mapping key for en_IL'
updated_at = <Date 2018-05-05.13:33:39.755>
user = 'https://github.com/Licht-T'

bugs.python.org fields:

activity = <Date 2018-05-05.13:33:39.755>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-05.12:42:29.534>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2018-05-05.12:18:32.528>
creator = 'licht-t'
dependencies = []
files = []
hgrepos = []
issue_num = 33432
keywords = ['patch']
message_count = 4.0
messages = ['316206', '316207', '316210', '316212']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'licht-t']
pr_nums = ['6707']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '20087'
type = 'behavior'
url = 'https://bugs.python.org/issue33432'
versions = ['Python 3.6']

[Licht-T]

The new locale en_IL is added to glibc.
But there is no key for this in the locale alias mapping.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=146ffc146fe3bf97cd3bc1a649f1ffa8acfa4a0d
https://github.com/python/cpython/blob/master/Lib/locale.py#L850

The locale in latest Ubuntu 18.04 contains en_IL as valid locale, but Python cannot resolve this.
This makes test failure in pandas.
pandas-dev/pandas#20957

(pandas-dev) [pandas] locale -a
C
C.UTF-8
en_AG
en_AG.utf8
en_AU.utf8
en_BW.utf8
en_CA.utf8
en_DK.utf8
en_GB.utf8
en_HK.utf8
en_IE.utf8
en_IL
en_IL.utf8
en_IN
en_IN.utf8
en_NG
en_NG.utf8
en_NZ.utf8
en_PH.utf8
en_SG.utf8
en_US.utf8
en_ZA.utf8
en_ZM
en_ZM.utf8
en_ZW.utf8
ja_JP.utf8
POSIX

[serhiy-storchaka]

This is a duplicate of bpo-20087. The patch that adds an alias for en_IL was merged, but then reverted.

[Licht-T]

en_IL has significant impact because this is English locale and now supported in the latest Ubuntu. Is there any plan to add only en_IL?

[serhiy-storchaka]

This should be discussed in bpo-20087.