[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Nick and/or Victor: should this be closed in favor of #15626? or should the latter be closed as mostly fixed, with this being left open as a followup?

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nosy: +terry.reedy, vstinner
versions:  -Python 3.6, Python 3.7

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