[3.8] bpo-29620: iterate over a copy of sys.modules (GH-4800) #20816
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unittest.TestCase.assertWarns no longer raises a RuntimeException
when accessing a module's
__warningregistry__
causes importation of a newmodule, or when a new module is imported in another thread.
Patch by Kernc.
(cherry picked from commit 46398fb)
Co-authored-by: kernc [email protected]
https://bugs.python.org/issue29620