Terry J. Reedy added the comment: Some time ago I tried adding 'root.withdraw' to idle_test files that used tkinter to stop the widget flashing. This never worked completely. Now I know why -- it was the test.support import. Knowing this now, I opened #27922 to add 'root.withdraw' where else needed. With support.__init__ patched, idle tests in 3.6 are currently flash-free, with -ugui, and 2.7 and 3.5 should be also. So unless there is objection by tomorrow, I will patch all three versions. I want the import flash suppressed even when -ugui is passed.
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