adding name to BZ2File

[ellaellela]

BPO	47217
Nosy	@ellaellela
PRs	bpo-47217: add name attribute to bz2 fileobject #32311

^{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 2022-04-04.18:49:04.461>
labels = ['type-feature', 'library', '3.11']
title = 'adding name to BZ2File'
updated_at = <Date 2022-04-04.18:49:45.782>
user = 'https://github.com/ellaellela'

bugs.python.org fields:

activity = <Date 2022-04-04.18:49:45.782>
actor = 'ellaellela'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-04-04.18:49:04.461>
creator = 'ellaellela'
dependencies = []
files = []
hgrepos = []
issue_num = 47217
keywords = ['patch']
message_count = 1.0
messages = ['416690']
nosy_count = 1.0
nosy_names = ['ellaellela']
pr_nums = ['32311']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47217'
versions = ['Python 3.11']

[ellaellela]

BZ2File doesn't have attribute name, unlike GzipFile which has it. Trying to access that attribute results in error.

PR is ready with code changes and tests which mimics what is already available for GzipFile (e.g. we do not take name from BytesIO() objects because they do not have it).
A similar PR is ready for LZMAFile as well (a different enhancement).

[serhiy-storchaka]

This is the part of more complex issue #115961.