Implement pathlib.Path.append_bytes and pathlib.Path.append_text

[pablogsal]

BPO	35095
Nosy	@pitrou, @nuno-andre, @keelung-yang
PRs	bpo-35095: Implement pathlib.Path.append_bytes and pathlib.Path.append_text #10193 bpo-35095: Add append_bytes() and append_text() to Path class #3811

^{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 2018-10-29.19:58:17.139>
created_at = <Date 2018-10-28.19:17:21.677>
labels = ['3.8', 'library']
title = 'Implement pathlib.Path.append_bytes and pathlib.Path.append_text'
updated_at = <Date 2022-01-24.21:08:02.569>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2022-01-24.21:08:02.569>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-29.19:58:17.139>
closer = 'pablogsal'
components = ['Library (Lib)']
creation = <Date 2018-10-28.19:17:21.677>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 35095
keywords = ['patch']
message_count = 4.0
messages = ['328730', '328858', '328859', '411453']
nosy_count = 3.0
nosy_names = ['pitrou', 'nuno', 'keelung-yang']
pr_nums = ['10193', '3811']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35095'
versions = ['Python 3.8']

[pablogsal]

Right now we have:

Path.read_bytes
Path.read_text
Path.write_bytes
Path.write_text

as opening the file, appending something and closing the file is also a very typical operation to do it would be nice to have:

Path.append_bytes
Path.append_text

[pitrou]

First, it is quite uncommon to open a file in append mode. Second, when you open in append mode, often you will gradually append (such as for a logfile), so a single method call isn't effective.

So I think this does not solve an important use case.

[pablogsal]

Thanks @pitrou for the feedback!

As you think this will not be that useful, I will close the issue and the proposal PR.

[keelung-yang]

@pitrou
Firstly, I can't agree with it is quite uncommon to open a file in append mode. It should be depended to users and their application scenes.

@pablogsal
Secondly, I think Path.write_*(, append=False) is better then adding new APIs, as discussed in https://stackoverflow.com/questions/57296168/pathlib-path-write-text-in-append-mode