Failed test_new_curses_panel in test_curses

[serhiy-storchaka]

BPO	42694
Nosy	@vstinner, @serhiy-storchaka, @koubaa
PRs	bpo-42694: Cannot create _curses_panel.panel #23948 bpo-1635741 port _curses_panel to multi-phase init (PEP 489) #21986

^{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 2020-12-26.01:18:28.307>
created_at = <Date 2020-12-20.21:10:00.930>
labels = ['3.10']
title = 'Failed test_new_curses_panel in test_curses'
updated_at = <Date 2020-12-26.01:18:28.307>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2020-12-26.01:18:28.307>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-26.01:18:28.307>
closer = 'vstinner'
components = []
creation = <Date 2020-12-20.21:10:00.930>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 42694
keywords = ['patch']
message_count = 3.0
messages = ['383453', '383784', '383788']
nosy_count = 3.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'koubaa']
pr_nums = ['23948', '21986']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42694'
versions = ['Python 3.10']

[serhiy-storchaka]

======================================================================
FAIL: test_new_curses_panel (test.test_curses.TestCurses)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/test/test_curses.py", line 425, in test_new_curses_panel
    self.assertRaises(TypeError, type(panel))
AssertionError: TypeError not raised by panel

---

The regression was introduced in 1baf030 (bpo-1635741). It can lead to crash because creation of non-initialized object is allowed now. See bpo-23815 for details.

[vstinner]

I can reproduce the issue with the command:

./python -m test -u all test_curses

I wrote PR 23948 to fix the regression.

Note: "./python -m test test_curses" doesn't fail since the test is skipped.

[vstinner]

New changeset 993e88c by Victor Stinner in branch 'master':
bpo-42694: Prevent creating _curses_panel.panel (GH-23948)
993e88c