The recent upload of python-tz is unable to migrate to Testing because
its autopkgtest is failing.

https://qa.debian.org/excuses.php?package=python-tz

Excerpt
======
cp: cannot stat 'src/pytz/tests': No such file or directory
autopkgtest: test unittest:  - - - - - - - - - - results - - - - - - - - - -
unittest             FAIL non-zero exit status 1

Thank you,
Jeremy Bícha