Replace with_traceback() with exception chaining and reraising

[arhadthedev]

BPO	47099
Nosy	@iritkatriel, @arhadthedev
PRs	bpo-47099: Replace with_traceback() with exception chaining and reraising #32074

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2022-03-30.15:11:25.405>
created_at = <Date 2022-03-23.10:42:51.369>
labels = ['type-feature', 'library', '3.11']
title = 'Replace with_traceback() with exception chaining and reraising'
updated_at = <Date 2022-03-30.15:11:25.405>
user = 'https://github.com/arhadthedev'

bugs.python.org fields:

activity = <Date 2022-03-30.15:11:25.405>
actor = 'arhadthedev'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-30.15:11:25.405>
closer = 'arhadthedev'
components = ['Library (Lib)']
creation = <Date 2022-03-23.10:42:51.369>
creator = 'arhadthedev'
dependencies = []
files = []
hgrepos = []
issue_num = 47099
keywords = ['patch']
message_count = 2.0
messages = ['415864', '415872']
nosy_count = 2.0
nosy_names = ['iritkatriel', 'arhadthedev']
pr_nums = ['32074']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47099'
versions = ['Python 3.11']

[arhadthedev]

Currently, exception chaining in Lib/ modules is implemented with pre-3.11 raise Foo(...).with_traceback(sys.exc_info()[2]). However, this approach can be simplified:

1. PEP-3134 introduced a proper raise Foo(...) from bar construction that takes a parent exception instead of its stack traceback

2. Without the traceback required, we partially get rid of sys.exc_info thus reducing active tapping into global internals

A report printed into a console remains the same except a line:

During handling of the above exception, another exception occurred

replaced with:

The above exception was the direct cause of the following exception

[iritkatriel]

You don't need sys.exc_info() for the traceback anymore.

except Exception as e:
    raise OSError('blah').with_traceback(e.__traceback__)