@martin.panter My new patch fixes Lib/test_optparse.py by suppressing the warning like test_imp does as you suggested.

@serhiy.storchaka I don't have a strong preference that it be a DeprecationWarning vs. PendingDeprecationWarning since to me, both get the point across to the end-user to avoid it.  I do, however, feel that it is important raise some kind of warning since it seems clear from the docs that is deprecated.

In my new patch I changed the type of warning to a PendingDeprecationWarning, as there seems to be at least some notion that optparse is a special case.  I don't have a strong opinion about which type of deprecation warning is used.

My new patch works when test_optparse.py is run with -Werror on 3.6.0a0.