[issue10990] tests mutating sys.gettrace() w/o re-instating previous state

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

And with this patch for test_zipimport_support to work thanks to the test_doctest changes, all of the test suites blasting the trace function *should* be fixed.

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Added file: http://bugs.python.org/file20519/test_zipimport_support.diff

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