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bpo-29620: iterate over a copy of sys.modules (GH-4800) (GH-29605)

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unittest.TestCase.assertWarns no longer raises a RuntimeException
when accessing a module's ``__warningregistry__`` causes importation of a new
module, or when a new module is imported in another thread.

Patch by Kernc.
(cherry picked from commit 46398fba4d)

Co-authored-by: kernc <kerncece@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-11-18 08:09:41 -08:00 • committed by GitHub
parent feccea6a7e
commit 71d842b9c1
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3 changed files with 19 additions and 1 deletions
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Lib/unittest/case.py
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@ -252,7 +252,7 @@ class _AssertWarnsContext(_AssertRaisesBaseContext):
def __enter__(self):
# The __warningregistry__'s need to be in a pristine state for tests
# to work properly.
for v in sys.modules.values():
for v in list(sys.modules.values()):
if getattr(v, '__warningregistry__', None):
v.__warningregistry__ = {}
self.warnings_manager = warnings.catch_warnings(record=True)