Message 223268 - Python tracker

Terry: the difference you saw between using regrtest and using unittest.main from the interactive prompt was because of regrtest.saved_test_environment: tkinter._fix sets environment variables at the beginning of one test which are cleared at the end by saved_test_environment, and not reset at the beginning of the next.  #20035 has my preferred fix for that situation.

Mark: Glad this helped, and thanks for the ping.