Add PurePath.with_stem()

[timhoffm]

BPO	40148
Nosy	@brettcannon, @pitrou, @timhoffm
PRs	bpo-40148 Add PurePath.with_stem() #19295

^{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 2020-04-19.15:30:07.552>
created_at = <Date 2020-04-02.00:40:24.877>
labels = ['type-feature', 'library', '3.9']
title = 'Add PurePath.with_stem()'
updated_at = <Date 2020-12-27.01:42:41.890>
user = 'https://github.com/timhoffm'

bugs.python.org fields:

activity = <Date 2020-12-27.01:42:41.890>
actor = 'tinyaoqi'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-19.15:30:07.552>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2020-04-02.00:40:24.877>
creator = 'timhoffm'
dependencies = []
files = []
hgrepos = []
issue_num = 40148
keywords = ['patch']
message_count = 4.0
messages = ['365540', '365608', '366785', '383834']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'pitrou', 'timhoffm', 'tinyaoqi']
pr_nums = ['19295']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40148'
versions = ['Python 3.9']

[timhoffm]

Similar to PurePath.with_name() and PurePath.with_suffix() there should be a PurePath.with_stem().

A common use case would be appending something before the suffix: path.with_stem(path.stem + '_v2')

As of now this must be written more cumbersome as:
path.with_name(path.stem + '_v2' + path.suffix)

[brettcannon]

I personally would rather not add more methods that are doing simple string manipulations.

[pitrou]

New changeset 8aea4b3 by Tim Hoffmann in branch 'master':
bpo-40148: Add PurePath.with_stem() (GH-19295)
8aea4b3

[tinyaoqi]

In Pathlib, we have functions "with_name()""with_stem()""with_suffix()" to modify the file name in the path.

In bpo-21798:"Allow adding Path or str to Path", it actually also want to modify the file name, that is "appand string to file name".

if with_stem() more cumbersome as:
path.with_name(path.stem + '_v2' + path.suffix)

why not have a function with_xxxx() more cumbersome as:
path.with_name(path.name + "_name.dat")