add {implementation} to sysconfig.py

[mattip]

BPO	22308
Nosy	@merwok, @mattip
Files	sysconfig_head.patch: diff to HEAD sysconfig_2_7.patch

^{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 2020-10-22.21:49:13.111>
created_at = <Date 2014-08-30.18:49:36.514>
labels = ['type-bug', 'library']
title = 'add {implementation} to sysconfig.py'
updated_at = <Date 2020-10-22.21:49:13.110>
user = 'https://github.com/mattip'

bugs.python.org fields:

activity = <Date 2020-10-22.21:49:13.110>
actor = 'eric.araujo'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-22.21:49:13.111>
closer = 'eric.araujo'
components = ['Library (Lib)']
creation = <Date 2014-08-30.18:49:36.514>
creator = 'mattip'
dependencies = []
files = ['36507', '36508']
hgrepos = []
issue_num = 22308
keywords = ['patch']
message_count = 4.0
messages = ['226143', '226144', '237705', '379367']
nosy_count = 2.0
nosy_names = ['eric.araujo', 'mattip']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue22308'
versions = []

[mattip]

An issue was reported on PyPy where a user had a ~/.local/lib/python2.7/site-packages directory that contained cpython specific libraries. We trakced it down to posix_user in sysconfig.py being set to an implementation-specific cpython path, but used by pypy.
This patch against HEAD adds {implementation} and {implementation_lower} fields to _CONFIG_VARS, making sysconfig.py compatable with other python implementations. Perhaps valuable to jython as well, which would require modifying _get_implementation() accordingly

[mattip]

adding a diff patch to 2.7

[mattip]

any traction on this?

[merwok]

This is a non-trivial change that would impact many packaging tools, and as such should be discussed on mailing list or https://discuss.python.org/