Allow copying of CodecInfo objects

[lehmannro]

BPO	21944
Nosy	@malemburg, @berkerpeksag
Files	copy_codecinfo.patch: patch to current default

^{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 = None
created_at = <Date 2014-07-09.11:52:09.214>
labels = ['type-feature', 'library', '3.11']
title = 'Allow copying of CodecInfo objects'
updated_at = <Date 2021-11-26.22:44:37.352>
user = 'https://bugs.python.org/lehmannro'

bugs.python.org fields:

activity = <Date 2021-11-26.22:44:37.352>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2014-07-09.11:52:09.214>
creator = 'lehmannro'
dependencies = []
files = ['35912']
hgrepos = []
issue_num = 21944
keywords = ['patch']
message_count = 2.0
messages = ['222609', '236755']
nosy_count = 3.0
nosy_names = ['lemburg', 'lehmannro', 'berker.peksag']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21944'
versions = ['Python 3.11']

Linked PRs

• gh-66143: Allow copying of CodecInfo object #100432
• gh-66143: Allow copying of CodecInfo object #109235

[lehmannro]

CodecInfo objects as retrieved from codecs.lookup currently throw an exception when trying to copy or pickle them.

I have attached a patch with a fix and tests.

[BreamoreBoy]

The change to codecs.py seems simple enough but would we usually use plain asserts in test code?

[furkanonder]

@lehmannro Are you gonna continue this task?

[furkanonder]

The PR is ready for review.

@serhiy-storchaka Can you review it?

[serhiy-storchaka]

Thanks @lehmannro for the initial patch and @furkanonder for bringing the issue to a successful end.