[issue29620] unittest.TestCase.assertWarns raises RuntimeEror if sys.modules changes size

[Maximilian Peters]

Maximilian Peters <peters.maximilian at gmail.com> added the comment:

Ran into the same issue using Python 3.6.8 [GCC 5.4.0 20160609] on Linux.

The same code worked on Windows 10 with Python 3.7 32-bit and 64-bit.

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nosy: +Maximilian Peters

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<https://bugs.python.org/issue29620>
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