[issue39892] Enable DeprecationWarnings by default when not explicit in unittest.main()

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Issue 10535 says they should already be on by default in unittest.

I seem to recall checking that was still true when implementing the default warning filter changes in 3.7.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39892>
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