os: linux
language: python
cache: pip
dist: xenial
python:
  - "2.7"
  - "3.4"
  - "3.5"
  - "3.6"
  - "3.7"
  - "3.8"
install:
  - pip install -U pip setuptools
  - pip install tox-travis
  - pip install codecov
  - if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then pip install pre-commit; fi
script:
  - tox
  - if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then pre-commit run --all-files; fi
after_success:
  - codecov