One more attempt to track down Debian/alpha test_math failures: add diagnostic information in the ValueError message.  This change is temporary, and will be reversed after the next run of the Debian/alpha buildbot.
One more attempt to track down Debian/alpha test_math failures:
add diagnostic information in the ValueError message.  This
change is temporary, and will be reversed after the next run
of the Debian/alpha buildbot.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator