I updated support one of my packages to test on Python 3.6 with Travis. For some reason only on Python 3.6 I am getting a failure and return code 120.
The command used in the build:
python -Werror -Wignore::DeprecationWarning -m coverage run test.py
Tests under Python 2.7, 3.3, 3.4, and 3.5 all pass successfully.