Remove macpath module

[vstinner]

BPO	35471
Nosy	@ronaldoussoren, @vstinner, @ned-deily
PRs	bpo-35471: Remove the macpath module #11129

^{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 2018-12-14.12:39:54.066>
created_at = <Date 2018-12-12.15:22:57.356>
labels = ['OS-mac', '3.8', 'library']
title = 'Remove macpath module'
updated_at = <Date 2018-12-14.12:39:54.065>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-12-14.12:39:54.065>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-14.12:39:54.066>
closer = 'vstinner'
components = ['Library (Lib)', 'macOS']
creation = <Date 2018-12-12.15:22:57.356>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 35471
keywords = ['patch']
message_count = 5.0
messages = ['331699', '331700', '331702', '331706', '331822']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'vstinner', 'ned.deily']
pr_nums = ['11129']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35471'
versions = ['Python 3.8']

[vstinner]

The module 'macpath' has been deprecated in Python 3.7 by bpo-9850 and scheduled for removal in Python 3.8. Attached PR removes the module.

[vstinner]

According to the PEP-11, MacOS 9 support has been dropped in Python 2.4 (released in 2004: 14 years ago!). So I think that it's now ok to remove the macpath module, especially because it's deprecated since Python 3.7.

[ronaldoussoren]

I'm in favour of removing macpath.

I was against removing the module in the past because parts of the macOS API still used (on probably still use) classic MacOS style paths. Most if not all APIs are by this time deprecated, which makes it less and less like that anyone will use macpath going forward.

[vstinner]

I was against removing the module in the past because parts of the macOS API still used (on probably still use) classic MacOS style paths. Most if not all APIs are by this time deprecated, which makes it less and less like that anyone will use macpath going forward.

bpo-9850 has a scary title: "obsolete macpath module dangerously broken and should be removed". Extract:

"Even if one did have a need to use the obsolete old-style paths, the macpath module is currently practically unusable for anything other than simple character manipulations of the path. Nearly all of the functions that actually call OS routines are broken in one or more ways."

[vstinner]

New changeset d7538dd by Victor Stinner in branch 'master':
bpo-35471: Remove the macpath module (GH-11129)
d7538dd