pathlib: make `_Accessor.open()` return a file object and not a file descriptor

[barneygale]

BPO	40107
Nosy	@zooba, @barneygale
PRs	bpo-40107: stop using os.open() to implement pathlib.Path.open() #25240

^{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 2021-04-09.22:03:35.867>
created_at = <Date 2020-03-29.22:37:39.513>
labels = ['type-feature', 'library', '3.10']
title = 'pathlib: make `_Accessor.open()` return a file object and not a file descriptor'
updated_at = <Date 2021-04-09.22:03:35.867>
user = 'https://github.com/barneygale'

bugs.python.org fields:

activity = <Date 2021-04-09.22:03:35.867>
actor = 'steve.dower'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-09.22:03:35.867>
closer = 'steve.dower'
components = ['Library (Lib)']
creation = <Date 2020-03-29.22:37:39.513>
creator = 'barneygale'
dependencies = []
files = []
hgrepos = []
issue_num = 40107
keywords = ['patch']
message_count = 2.0
messages = ['365283', '390667']
nosy_count = 2.0
nosy_names = ['steve.dower', 'barneygale']
pr_nums = ['25240']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40107'
versions = ['Python 3.10']

[barneygale]

This is one of a series of bug reports / PRs that lay the groundwork for making pathlib extensible. See here for detail: https://discuss.python.org/t/make-pathlib-extensible/3428

Currently _Accessor.open() is expected to function like os.open() and return a file descriptor. I'd suggest this interface is too low-level if our eventual aim is to allow users to implement their own accessor.

It would be better is _Accessor.open() is expected to function like io.open() and return a file object. That way, accessors don't need to deal with file descriptors at all, which is important if they're working with remote filesystems.

I'm planning to wait for bpo-39895 / #63038 to land before starting work on this.

[zooba]

New changeset 11c3bd3 by Barney Gale in branch 'master':
bpo-40107: Switch to using io.open() for pathlib.Path.open() (GH-25240)
11c3bd3