ntpath module must not be available on POSIX platforms

[opensource-assist]

BPO	39319
Nosy	@eryksun, @opensource-assist

^{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 2020-01-13.12:18:10.006>
created_at = <Date 2020-01-13.10:58:01.750>
labels = ['invalid', 'type-bug', 'library', '3.9']
title = 'ntpath module must not be available on POSIX platforms'
updated_at = <Date 2020-01-13.20:59:14.368>
user = 'https://github.com/opensource-assist'

bugs.python.org fields:

activity = <Date 2020-01-13.20:59:14.368>
actor = 'opensource-assist'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-13.12:18:10.006>
closer = 'eryksun'
components = ['Library (Lib)']
creation = <Date 2020-01-13.10:58:01.750>
creator = 'opensource-assist'
dependencies = []
files = []
hgrepos = []
issue_num = 39319
keywords = []
message_count = 3.0
messages = ['359897', '359900', '359934']
nosy_count = 2.0
nosy_names = ['eryksun', 'opensource-assist']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39319'
versions = ['Python 3.9']

[opensource-assist]

According to https://docs.python.org/dev/library/undoc.html the 'ntpath' module is an "Implementation of os.path on Win32 and Win64 platforms".
Just like all other Windows-specific modules(like winreg),'ntpath' must not be available for use on a POSIX system like Linux.
I guess that 'posixpath' is also available on Windows, that if it is, it must not be available too.

[eryksun]

No, ntpath and posixpath are cross-platform. They are tested on all platforms, and the os.path documentation lists them and notes that "you can also import and use the individual modules if you want to manipulate a path that is always in one of the different formats".

[opensource-assist]

@eryksun So modify the documentation to note that they're operable on both platforms.
I've seen that ntpath worked on my Linux system, but the documentation was misleading.