Unfortunately the mozlog Python 3 compatibility bug has regressed due to the new mozterm package: ../python/lib/python3.6/site-packages/mozlog/formatters/machformatter.py:10: in <module> from mozterm import Terminal ../python/lib/python3.6/site-packages/mozterm/__init__.py:6: in <module> from .terminal import Terminal, NullTerminal # noqa ../python/lib/python3.6/site-packages/mozterm/terminal.py:11: in <module> class NullTerminal(object): ../python/lib/python3.6/site-packages/mozterm/terminal.py:24: in NullTerminal class NullCallableString(unicode): E NameError: name 'unicode' is not defined It would be good to fix this and expand the Python 3 linter coverage to include mozterm too (and ideally have an opt-out rather than opt-in system for what's passing the linters under Python 3, so no more newly added packages get created as Python 3 incompatible).