Need to use the exception class qualname when rendering exception (in C code)

[iritkatriel]

BPO	45083
Nosy	@vstinner, @ambv, @serhiy-storchaka, @pablogsal, @miss-islington, @iritkatriel, @DiddiLeija
PRs	bpo-45083: Include the exception class qualname when formatting an ex… #28119 [3.10] bpo-45083: Include the exception class qualname when formatting an exception (GH-28119) #28134 [3.9] bpo-45083: Include the exception class qualname when formatting an exception (GH-28119) #28135

^{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 2021-09-15.17:36:44.258>
created_at = <Date 2021-09-01.21:46:35.493>
labels = ['interpreter-core', 'type-bug', '3.9', '3.10', '3.11']
title = 'Need to use the exception class qualname when rendering exception (in C code)'
updated_at = <Date 2021-09-15.17:36:44.258>
user = 'https://github.com/iritkatriel'

bugs.python.org fields:

activity = <Date 2021-09-15.17:36:44.258>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-15.17:36:44.258>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2021-09-01.21:46:35.493>
creator = 'iritkatriel'
dependencies = []
files = []
hgrepos = []
issue_num = 45083
keywords = ['patch']
message_count = 13.0
messages = ['400873', '400886', '400983', '401005', '401400', '401401', '401403', '401413', '401456', '401459', '401498', '401504', '401788']
nosy_count = 7.0
nosy_names = ['vstinner', 'lukasz.langa', 'serhiy.storchaka', 'pablogsal', 'miss-islington', 'iritkatriel', 'DiddiLeija']
pr_nums = ['28119', '28134', '28135']
priority = None
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45083'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[iritkatriel]

iritkatriel@Irits-MBP cpython % cat exc.py

class A:
  class B:
    class E(Exception):
      pass

raise A.B.E()

iritkatriel@Irits-MBP cpython % cat test.py

import exc

iritkatriel@Irits-MBP cpython % ./python.exe test.py 
Traceback (most recent call last):
  File "/Users/iritkatriel/src/cpython/test.py", line 2, in <module>
    import exc
    ^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/exc.py", line 7, in <module>
    raise A.B.E()
    ^^^^^^^^^^^^^
exc.E

==============
See the last line of the output: there is no such thing as exc.E. There is exc.A.B.E.

The traceback module doesn't have this issue:

iritkatriel@Irits-MBP cpython % cat test.py

import traceback

try:
import exc
except Exception as e:
traceback.print_exception(e)

iritkatriel@Irits-MBP cpython % ./python.exe test.py 
Traceback (most recent call last):
  File "/Users/iritkatriel/src/cpython/test.py", line 5, in <module>
    import exc
    ^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/exc.py", line 7, in <module>
    raise A.B.E()
    ^^^^^^^^^^^^^
exc.A.B.E

[iritkatriel]

I've reproduced this on 3.9 and 3.10 as well.

[ambv]

New changeset b4b6342 by Irit Katriel in branch 'main':
bpo-45083: Include the exception class qualname when formatting an exception (GH-28119)
b4b6342