Debian crazyness

python-tz

the python-tz 2016.7-0.3 updates is in fact 2017.2 The line to watch out for in http://metadata.ftp-master.debian.org/changelogs/main/p/python-tz/python-tz_2016.7-0.3_changelog “Apply patch from upstream to assume tzdata/2017a abbreviations for timezones.”

python-requests

requests bundles a patched version of urllib3, Debian unbundles, this leads to a boat-load of bugs, check vdirsyncer’s issue tracker

I can’t really decide if it’s Debian or requests who are at fault here.