Message 243620 - Python tracker

To answer my question, I checked test___all__.py. The check_all helper has this:
        with support.check_warnings(
            (".* (module|package)", DeprecationWarning),
            ("", ResourceWarning),
            quiet=True):
I presume this means that DeprecationWarnings raised by the following import are suppressed.  (There is also a  blacklist.)