Python 2.x will no longer be supported by their upstream developers in 2020. Thus Debian developers are actively removing Python 2 support in Debian Testing with the goal of getting rid of Python 2 in Debian 11 (bullseye). We must do the same as our packages relying on Python 2 modules provided by Debian will start to break... wol-e depends on Python 2.x and needs to be reviewed. Applications have to switch to Python 3. Python modules have to stop providing packages for Python 2 (as soon as no other packages depend on the Python 2 version of the module). In any case, this work must be done in coordination with upstream. Tag the issue with ~Forwarded once you have opened an upstream issue requesting this. If the package can't be fixed currently, then tag the bug with ~Blocked and add the issues of the blocking packages as “Related issues”.